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The Stanford Prison Experiment Is Now A Reality Show

The Stanford Prison Experiment Is Now A Reality Show

Philip Zimbardo’s legendary 1971 Stanford Prison Experiment is one of the most well-known, and notorious, research experiments in recent history.

It has been the subject of countless books, TV episodes and podcasts – and now Netflix is turning it into a reality TV series.

But what was the Stanford Prison Experiment, really? A dive into psychology and cruelty? Or a flawed power trip? And is transforming this infamous event into a reality show tempting fate?

A rundown of Stanford University’s most well-known study

Zimbardo was a psychologist at Stanford University who specialised in environmental psychology, social influences and personality traits.

In 1971, Zimbardo and his team transformed the Stanford University Psychology Building basement into a makeshift prison. He sought to study how prison environments, labels and dehumanisation can impact how regular people treat each other.

The study recruited 24 college-aged men, assigning each participant to be either a “prisoner” or a “guard” via a coin flip.

The guards were given matching uniforms meant to symbolise power, anonymity and identity. The guards also sat down with the researchers for an orientation into how they needed to behave. They were informed to maintain an environment of law and order, to create a sense of powerlessness, but not to be cruel.

Meanwhile, the prisoners were unexpectedly arrested by Palo Alto police. They were booked, fingerprinted and strip-searched. They were assigned their own uniforms which symbolised dehumanisation, humiliation and helplessness.

In Zimbardo’s own narrative of the event, he consistently presents himself as the leader of the guards, the “super-intendent”, not an impartial researcher.

The study was designed to last 14 days. But after multiple emotional and psychotic breakdowns, cruel and collective punishment by the guards, expressions of concern by parents, and multiple critical and appalling reviews by other professors within the department over how the environment had changed everyone – Zimbardo included – the study was terminated after just six days.

A legacy

The experiment has become well-known when discussing environmental impact on human interaction.

Zimbardo’s findings and reflections suggested situational and environmental causes can drive people to adopt criminal, cruel or just vastly different personas from their everyday lives.

Yet, to other researchers, it has become controversial and many have fully dismissed it as unscientific and unethical due to the researcher’s influencing of the guards’ behaviours and biases, a phenomena referred to in experiments as “demand characteristics”.

Subsequent studies have expressed how the experiment cannot be used to discuss how the environment shapes human interaction. Instead, researchers suggest the initial orientation and the role of the researcher’s leadership played a role in influencing the guards’ behaviour, not the environment.

In Zimbardo’s 1973 ethical reflection of the study, he discusses the philosophical implications of the experiment and justified it based on its outcomes, findings and potential impact.

Yet, Zimbardo’s study was one of many in the 1960s and ‘70s that led to a push for greater protection for participants in research. While there had been some progress in the years before the experiment, the American National Research Act of 1974 set forth the expectations for protection of research participants. This mandated what we understand and refer to as ethics approval today.

Stanford University accepts this experiment would never be allowed to happen today.

Legal responsibility and duty of care

Law enforcement and prison guards are expected, by nature of their jobs, to be tough. But these jobs require more than just muscle and bravado. These careers require observational skills, delicate decision making, legal knowledge, self-control, and yes, physical confrontation.

But these individuals are specially trained for these positions. They require extensive preparation and education, have a system of oversight and transparency, can be openly investigated, and are accountable for their actions. They have to maintain the lawful authority placed upon them and control and maintain those under their supervision, but also while providing care.

By balancing lawful authority and the power of their position, they must prioritise the health, wellbeing and support of the individuals for which they are responsible.

While law enforcement and corrections officers do commit violations, they have to answer for them.

Netflix’s shady new show

Netflix is billing its new series as a “modern reimagining” of the 1971 experiment, where 30 people will enter a “real prison” for two weeks.

There are many questions we need to be asking about the ethics of recreating this experiment in a reality show format. How are contestants and producers going to be held responsible? What oversight are they going to have? What authority? And more importantly, who are they?

And given the expectation of this experiment, the publicity and pressure accompanying reality TV, and the nature of people who participate in reality shows, often referred to as self-selection bias, what should we expect from the participants? Will the new “guards” and “wardens” fare any better than Zimbardo?

This show will be copying one of the most notorious breaches of duty of care in research.

With one of the world’s largest streaming services producing this show, it raises important questions about what exactly we remember about the study and what we expect from our media.

Equally important, we should question our willingness to consume it.

By Noah D. Cohen, Associate Lecturer, Associate Degree in Applied Policing, Western Sydney University. This article is republished from The Conversation under a Creative Commons license. Read the original article. Featured image Duke Downey/San Francisco Chronicle via Getty Images, provided by The Conversation. The Conversation

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The Stanford Prison Experiment Is Now A Reality Show

Philip Zimbardo’s legendary 1971 Stanford Prison Experiment is one of the most well-known, and notorious, research experiments in recent history.

It has been the subject of countless books, TV episodes and podcasts – and now Netflix is turning it into a reality TV series.

But what was the Stanford Prison Experiment, really? A dive into psychology and cruelty? Or a flawed power trip? And is transforming this infamous event into a reality show tempting fate?

A rundown of Stanford University’s most well-known study

Zimbardo was a psychologist at Stanford University who specialised in environmental psychology, social influences and personality traits.

In 1971, Zimbardo and his team transformed the Stanford University Psychology Building basement into a makeshift prison. He sought to study how prison environments, labels and dehumanisation can impact how regular people treat each other.

The study recruited 24 college-aged men, assigning each participant to be either a “prisoner” or a “guard” via a coin flip.

The guards were given matching uniforms meant to symbolise power, anonymity and identity. The guards also sat down with the researchers for an orientation into how they needed to behave. They were informed to maintain an environment of law and order, to create a sense of powerlessness, but not to be cruel.

Meanwhile, the prisoners were unexpectedly arrested by Palo Alto police. They were booked, fingerprinted and strip-searched. They were assigned their own uniforms which symbolised dehumanisation, humiliation and helplessness.

In Zimbardo’s own narrative of the event, he consistently presents himself as the leader of the guards, the “super-intendent”, not an impartial researcher.

The study was designed to last 14 days. But after multiple emotional and psychotic breakdowns, cruel and collective punishment by the guards, expressions of concern by parents, and multiple critical and appalling reviews by other professors within the department over how the environment had changed everyone – Zimbardo included – the study was terminated after just six days.

A legacy

The experiment has become well-known when discussing environmental impact on human interaction.

Zimbardo’s findings and reflections suggested situational and environmental causes can drive people to adopt criminal, cruel or just vastly different personas from their everyday lives.

Yet, to other researchers, it has become controversial and many have fully dismissed it as unscientific and unethical due to the researcher’s influencing of the guards’ behaviours and biases, a phenomena referred to in experiments as “demand characteristics”.

Subsequent studies have expressed how the experiment cannot be used to discuss how the environment shapes human interaction. Instead, researchers suggest the initial orientation and the role of the researcher’s leadership played a role in influencing the guards’ behaviour, not the environment.

In Zimbardo’s 1973 ethical reflection of the study, he discusses the philosophical implications of the experiment and justified it based on its outcomes, findings and potential impact.

Yet, Zimbardo’s study was one of many in the 1960s and ‘70s that led to a push for greater protection for participants in research. While there had been some progress in the years before the experiment, the American National Research Act of 1974 set forth the expectations for protection of research participants. This mandated what we understand and refer to as ethics approval today.

Stanford University accepts this experiment would never be allowed to happen today.

Legal responsibility and duty of care

Law enforcement and prison guards are expected, by nature of their jobs, to be tough. But these jobs require more than just muscle and bravado. These careers require observational skills, delicate decision making, legal knowledge, self-control, and yes, physical confrontation.

But these individuals are specially trained for these positions. They require extensive preparation and education, have a system of oversight and transparency, can be openly investigated, and are accountable for their actions. They have to maintain the lawful authority placed upon them and control and maintain those under their supervision, but also while providing care.

By balancing lawful authority and the power of their position, they must prioritise the health, wellbeing and support of the individuals for which they are responsible.

While law enforcement and corrections officers do commit violations, they have to answer for them.

Netflix’s shady new show

Netflix is billing its new series as a “modern reimagining” of the 1971 experiment, where 30 people will enter a “real prison” for two weeks.

There are many questions we need to be asking about the ethics of recreating this experiment in a reality show format. How are contestants and producers going to be held responsible? What oversight are they going to have? What authority? And more importantly, who are they?

And given the expectation of this experiment, the publicity and pressure accompanying reality TV, and the nature of people who participate in reality shows, often referred to as self-selection bias, what should we expect from the participants? Will the new “guards” and “wardens” fare any better than Zimbardo?

This show will be copying one of the most notorious breaches of duty of care in research.

With one of the world’s largest streaming services producing this show, it raises important questions about what exactly we remember about the study and what we expect from our media.

Equally important, we should question our willingness to consume it.

By Noah D. Cohen, Associate Lecturer, Associate Degree in Applied Policing, Western Sydney University. This article is republished from The Conversation under a Creative Commons license. Read the original article. Featured image Duke Downey/San Francisco Chronicle via Getty Images, provided by The Conversation. The Conversation

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Categories


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6th batch of Pentagon UAP files: Air Force talk and more


This infrared video was recorded over a U.S. military platform in 2025. It shows 6 small apparent spheres or orbs making changes in direction and moving at an estimated 480 miles per hour (770 kph), according to the United States Central Command. The video is part of the 6th batch of Pentagon UAP files. Video via DoD.

Science news, night sky events and beautiful photos, all in one place. Click here to subscribe to our free daily newsletter.

  • The U.S. Pentagon released the 6th batch of formerly hidden UAP files on September 18, 2026.
  • The release contains a mix of video, image and document files. There are 72 new files in all, and 15 are videos, 56 are documents and one is audio.
  • The release is part of a continuing rollout of formerly classified files, every few weeks. And again so far, there’s been no “smoking gun” to show that alien craft are visiting Earth. Still, the files are interesting.

Pentagon UAP files: Part 6

The U.S. Pentagon released its 1st batch of declassified UAP/UFO materials on May 8, 2026. And now it has just made public batch 6. There are 72 new files in all in batch 6, including 15 videos, 56 documents and one audio. There are no image files this time around. All the files are on the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE) website.

And as usual, Sean Parnell, Assistant to the Secretary of Defense for Public Affairs and Chief Pentagon Spokesman, said in a statement that the Department of Defense:

… is publishing the 6th release of declassified and historical Unidentified Anomalous Phenomena (UAP) files as part of the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE). The collection continues to be housed at WAR.GOV/UFO, and the Department will release additional files on a rolling basis.

For context, the Pentagon released a 2nd batch on May 22, a 3rd batch on June 12, the 4th batch on July 10 and the 5th batch on August 7, all in 2026.

As has been the pattern for these releases, they are a mixed bag of old and previously known material, and newer material. Do the releases prove aliens exist, or that alien craft are visiting Earth? Not so far.

Small spheres above a U.S. military platform

One of the more interesting military videos is one recorded of several small spheres over a U.S. military platform in 2025 (see video at top and image below). The infrared video apparently shows six small spheres or orbs, as described by the United States Central Command. The description states:

The United States Central Command submitted a report of an unidentified anomalous phenomenon to the All-domain Anomaly Resolution Office (AARO) consisting of one minute of video footage from an infrared sensor aboard a U.S. military platform in 2025. An accompanying mission report, DOW-UAP-D108, described the UAP as ‘six small spherical objects grouped together, and characterized their behavior as ‘seem[ingly] agile,’ and ‘frequently changing direction.’ The reporter estimated the speed of the UAP to have been 480 miles per hour [770 kph].

Pentagon UAP files: 6 bright white dots, in 2 pairs of 3, forming 2 triangles.
Still frame from the 2025 video showing 6 small apparent spheres or orbs over a U.S. military platform. Image via DoD. Read more about the latest Pentagon UAP files below.

Captain Edward Ruppelt ‘Flying Saucer Talk’ in 1952

Included in this batch is the audio recording of a talk on UAP given by Captain Edward Ruppelt of the U.S. Air Force on March 26, 1952. Ruppelt later headed the well-known Project Blue Book study of UAP. The description states:

This audio file records a March 1952 presentation by Captain Edward J. Ruppelt, outlining the U.S. Air Force’s reorganized investigation into unidentified flying objects (UFOs). The presentation previews prospective technical methodologies, such as diffraction-grating photography and radar-scope synchronization, that were subsequently incorporated into Project Blue Book, a U.S. Air Force program active from 1952 to 1969 that investigated the nature and origin of UFOs. Ruppelt explains that out of approximately 800 historical cases reviewed by the Air Force, approximately 20% remained unexplained after technical analysis.

These unresolved reports were sourced from credible military personnel, commercial pilots and other qualified technical observers. He highlights geographic report concentrations around sensitive national security and nuclear weapons installations (including Los Alamos, Albuquerque, and Oak Ridge National Laboratories) and notes recurring anomalous characteristics, including silent high-speed flight and radar detections indicating unconfirmed air speeds between 1,000 and 3,500 miles per hour [around 1,600 to 5600 kph].

Emphasizing that the Air Force found no conclusive evidence regarding the nature or origin of the phenomena, Ruppelt underscores the national security need for a systematic physical data collection effort to better evaluate these sightings.

20% are ‘good reports’

Ruppelt’s basic conclusion, as stated:

We’ve gone through these reports and come up with the fact that about 20% are very good reports offered by very reliable people and are just absolutely no conclusions can be drawn.

And there’d been some chatter on social media that Ruppelt’s talk included the famous sightings of disks over Washington, D.C. in 1952. But those sightings didn’t happen until July 26, 1952, some months after the talk.

In additon, there are other files related to Project Blue Book.

You can listen to Ruppelt’s presentation (about an hour long) here and read a thread of the entire transcript here.

Tremonton, Utah, 1952

One of the primary documents is the Project Blue Book investigation of the famous Tremonton, Utah, video from July 2, 1952. The film shows a large group of small white objects flying in the blue sky.

The film has also been studied, analyzed and debated multiple times by others ever since, with no firm conclusions. The Project Blue Book study itself suggested sea birds as a likely explanation, however.


The famous Tremonton, Utah, film from July 2, 1952. A large group of small white objects can be seen moving in the blue sky. Video via DoD.

Defense Intelligence Reference Documents

This release also includes 37 “Defense Intelligence Reference Documents,” or DIRDs. They were produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP, 2008-2012) that dealt with fringe or futuristic topics like warp drives, wormholes, antigravity, negative mass propulsion and invisibility cloaking. All of them have already been publicly available for years. Some had been released through Freedom of Information Act releases by the Defense Intelligence Agency (DIA). These “new” versions do include some details that had been previously withheld, though, such as the names of the agency offices that produced the documents.

One 38-page DIRD from 2010 analyzed what the report called:

… evidence of unintended injury to human observers by anomalous advanced aerospace systems.

One case was said to involve:

… three previous fit and active individuals experienced an anomalous [‘irregular, incongruous and inconsistent with their domain’] aerospace-related event.

The individuals were said to have:

… suffered a range of medical symptoms in the aftermath, including heat and redness on their skin and hair loss. One of the individuals showed ‘signs of radiation illness’ and ‘over several years developed signs of malignant transformations.’

Page from a document showing a round ring with a thin wire wrapping around it.
6th page of one of the 38 Defense Intelligence Reference Documents (DIRDs) produced for the Advanced Aerospace Weapon System Applications Program (AAWSAP) on March 30, 2010. This one covered research into antigravity. Image via DoD.

Legal waiver for government personnel on UAP

And in related news … on September 14, 2026, the U.S. government also announced a legal waiver that would allow current and former employees previously bound by nondisclosure agreements to share UAP-related information with the government’s PURSUE office.

As some have noted, the waiver is only for DOW/DoD employees, not people in the U.S. intelligence community. The press release states in part:

Under this directive, all current and former DOW service members, civilian personnel, and contractors holding or previously granted access to UAP-related National Defense Information (NDI) are authorized to disclose protected information directly to official PURSUE representatives. The waiver supersedes civil and administrative enforcement provisions contained within Non-Disclosure Agreements (NDAs) and Special Access Program Indoctrination Agreements (SAPIAs) previously executed within the United States, strictly for communications directed to the PURSUE team.


This infrared video, submitted by United States Indo-Pacific Command, shows a small white UAP flying above clouds and the ocean in 2023. Video via DoD.

Bottom line: The 6th batch of the Pentagon UAP files has just been released. Read about a U.S. Air Force talk on UAP from 1952, see more videos and more.

Read more:

Video files can be seen and downloaded here

Document files can be seen and downloaded here

Audio file can be seen and downloaded here

Pentagon releases more UFO files, including documents on secretive military program

Department of War Publishes Sixth Release of Unidentified Anomalous Phenomena Files on WAR.GOV/UFO

Pentagon releases sixth batch of UFO files

Pentagon offers new ‘targeted legal relief’ for UAP whistleblowers supporting Trump’s PURSUE work

Department of War Issues Legal Waiver to Authorize Unidentified Anomalous Phenomena (UAP) Disclosures to PURSUE

The post 6th batch of Pentagon UAP files: Air Force talk and more first appeared on EarthSky.



from EarthSky https://ift.tt/FY9UcHK


This infrared video was recorded over a U.S. military platform in 2025. It shows 6 small apparent spheres or orbs making changes in direction and moving at an estimated 480 miles per hour (770 kph), according to the United States Central Command. The video is part of the 6th batch of Pentagon UAP files. Video via DoD.

Science news, night sky events and beautiful photos, all in one place. Click here to subscribe to our free daily newsletter.

  • The U.S. Pentagon released the 6th batch of formerly hidden UAP files on September 18, 2026.
  • The release contains a mix of video, image and document files. There are 72 new files in all, and 15 are videos, 56 are documents and one is audio.
  • The release is part of a continuing rollout of formerly classified files, every few weeks. And again so far, there’s been no “smoking gun” to show that alien craft are visiting Earth. Still, the files are interesting.

Pentagon UAP files: Part 6

The U.S. Pentagon released its 1st batch of declassified UAP/UFO materials on May 8, 2026. And now it has just made public batch 6. There are 72 new files in all in batch 6, including 15 videos, 56 documents and one audio. There are no image files this time around. All the files are on the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE) website.

And as usual, Sean Parnell, Assistant to the Secretary of Defense for Public Affairs and Chief Pentagon Spokesman, said in a statement that the Department of Defense:

… is publishing the 6th release of declassified and historical Unidentified Anomalous Phenomena (UAP) files as part of the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE). The collection continues to be housed at WAR.GOV/UFO, and the Department will release additional files on a rolling basis.

For context, the Pentagon released a 2nd batch on May 22, a 3rd batch on June 12, the 4th batch on July 10 and the 5th batch on August 7, all in 2026.

As has been the pattern for these releases, they are a mixed bag of old and previously known material, and newer material. Do the releases prove aliens exist, or that alien craft are visiting Earth? Not so far.

Small spheres above a U.S. military platform

One of the more interesting military videos is one recorded of several small spheres over a U.S. military platform in 2025 (see video at top and image below). The infrared video apparently shows six small spheres or orbs, as described by the United States Central Command. The description states:

The United States Central Command submitted a report of an unidentified anomalous phenomenon to the All-domain Anomaly Resolution Office (AARO) consisting of one minute of video footage from an infrared sensor aboard a U.S. military platform in 2025. An accompanying mission report, DOW-UAP-D108, described the UAP as ‘six small spherical objects grouped together, and characterized their behavior as ‘seem[ingly] agile,’ and ‘frequently changing direction.’ The reporter estimated the speed of the UAP to have been 480 miles per hour [770 kph].

Pentagon UAP files: 6 bright white dots, in 2 pairs of 3, forming 2 triangles.
Still frame from the 2025 video showing 6 small apparent spheres or orbs over a U.S. military platform. Image via DoD. Read more about the latest Pentagon UAP files below.

Captain Edward Ruppelt ‘Flying Saucer Talk’ in 1952

Included in this batch is the audio recording of a talk on UAP given by Captain Edward Ruppelt of the U.S. Air Force on March 26, 1952. Ruppelt later headed the well-known Project Blue Book study of UAP. The description states:

This audio file records a March 1952 presentation by Captain Edward J. Ruppelt, outlining the U.S. Air Force’s reorganized investigation into unidentified flying objects (UFOs). The presentation previews prospective technical methodologies, such as diffraction-grating photography and radar-scope synchronization, that were subsequently incorporated into Project Blue Book, a U.S. Air Force program active from 1952 to 1969 that investigated the nature and origin of UFOs. Ruppelt explains that out of approximately 800 historical cases reviewed by the Air Force, approximately 20% remained unexplained after technical analysis.

These unresolved reports were sourced from credible military personnel, commercial pilots and other qualified technical observers. He highlights geographic report concentrations around sensitive national security and nuclear weapons installations (including Los Alamos, Albuquerque, and Oak Ridge National Laboratories) and notes recurring anomalous characteristics, including silent high-speed flight and radar detections indicating unconfirmed air speeds between 1,000 and 3,500 miles per hour [around 1,600 to 5600 kph].

Emphasizing that the Air Force found no conclusive evidence regarding the nature or origin of the phenomena, Ruppelt underscores the national security need for a systematic physical data collection effort to better evaluate these sightings.

20% are ‘good reports’

Ruppelt’s basic conclusion, as stated:

We’ve gone through these reports and come up with the fact that about 20% are very good reports offered by very reliable people and are just absolutely no conclusions can be drawn.

And there’d been some chatter on social media that Ruppelt’s talk included the famous sightings of disks over Washington, D.C. in 1952. But those sightings didn’t happen until July 26, 1952, some months after the talk.

In additon, there are other files related to Project Blue Book.

You can listen to Ruppelt’s presentation (about an hour long) here and read a thread of the entire transcript here.

Tremonton, Utah, 1952

One of the primary documents is the Project Blue Book investigation of the famous Tremonton, Utah, video from July 2, 1952. The film shows a large group of small white objects flying in the blue sky.

The film has also been studied, analyzed and debated multiple times by others ever since, with no firm conclusions. The Project Blue Book study itself suggested sea birds as a likely explanation, however.


The famous Tremonton, Utah, film from July 2, 1952. A large group of small white objects can be seen moving in the blue sky. Video via DoD.

Defense Intelligence Reference Documents

This release also includes 37 “Defense Intelligence Reference Documents,” or DIRDs. They were produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP, 2008-2012) that dealt with fringe or futuristic topics like warp drives, wormholes, antigravity, negative mass propulsion and invisibility cloaking. All of them have already been publicly available for years. Some had been released through Freedom of Information Act releases by the Defense Intelligence Agency (DIA). These “new” versions do include some details that had been previously withheld, though, such as the names of the agency offices that produced the documents.

One 38-page DIRD from 2010 analyzed what the report called:

… evidence of unintended injury to human observers by anomalous advanced aerospace systems.

One case was said to involve:

… three previous fit and active individuals experienced an anomalous [‘irregular, incongruous and inconsistent with their domain’] aerospace-related event.

The individuals were said to have:

… suffered a range of medical symptoms in the aftermath, including heat and redness on their skin and hair loss. One of the individuals showed ‘signs of radiation illness’ and ‘over several years developed signs of malignant transformations.’

Page from a document showing a round ring with a thin wire wrapping around it.
6th page of one of the 38 Defense Intelligence Reference Documents (DIRDs) produced for the Advanced Aerospace Weapon System Applications Program (AAWSAP) on March 30, 2010. This one covered research into antigravity. Image via DoD.

Legal waiver for government personnel on UAP

And in related news … on September 14, 2026, the U.S. government also announced a legal waiver that would allow current and former employees previously bound by nondisclosure agreements to share UAP-related information with the government’s PURSUE office.

As some have noted, the waiver is only for DOW/DoD employees, not people in the U.S. intelligence community. The press release states in part:

Under this directive, all current and former DOW service members, civilian personnel, and contractors holding or previously granted access to UAP-related National Defense Information (NDI) are authorized to disclose protected information directly to official PURSUE representatives. The waiver supersedes civil and administrative enforcement provisions contained within Non-Disclosure Agreements (NDAs) and Special Access Program Indoctrination Agreements (SAPIAs) previously executed within the United States, strictly for communications directed to the PURSUE team.


This infrared video, submitted by United States Indo-Pacific Command, shows a small white UAP flying above clouds and the ocean in 2023. Video via DoD.

Bottom line: The 6th batch of the Pentagon UAP files has just been released. Read about a U.S. Air Force talk on UAP from 1952, see more videos and more.

Read more:

Video files can be seen and downloaded here

Document files can be seen and downloaded here

Audio file can be seen and downloaded here

Pentagon releases more UFO files, including documents on secretive military program

Department of War Publishes Sixth Release of Unidentified Anomalous Phenomena Files on WAR.GOV/UFO

Pentagon releases sixth batch of UFO files

Pentagon offers new ‘targeted legal relief’ for UAP whistleblowers supporting Trump’s PURSUE work

Department of War Issues Legal Waiver to Authorize Unidentified Anomalous Phenomena (UAP) Disclosures to PURSUE

The post 6th batch of Pentagon UAP files: Air Force talk and more first appeared on EarthSky.



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Great Square of Pegasus gallops into the autumn sky

Great Square of Pegasus

Throughout late September and October evenings, the Great Square of Pegasus is ascending in the eastern evening sky. Then the Great Square will be high in the sky around the December solstice. And it’ll disappear from the evening sky sometime in February.

The Great Square is an asterism — an obvious pattern of stars — that consists of four stars of nearly equal brightness. Specifically, they are Scheat, Alpheratz, Markab and Algenib. The star Alpheratz is part of the constellation Andromeda and joins with three stars from Pegasus to form the Great Square.

The constellation Pegasus represents a Flying Horse. But the Great Square — the prominent asterism within Pegasus — is a landmark of the Northern Hemisphere’s autumn sky.

Great Square of Pegasus: Sky chart of a sprawing constellation with stars and Great Square labeled.
The Great Square of Pegasus consists of 4 stars of nearly equal brightness: Scheat, Alpheratz, Markab and Algenib. The Great Square is an asterism within the constellation Pegasus. But the star Alpheratz belongs to the constellation Andromeda.

To find the Great Square

To find the Great Square, use the Big Dipper to star-hop to Polaris, the North Star. Then draw an imaginary line from Polaris until you land on the outer star of the W or M-shaped constellation Cassiopeia the Queen.

Finally, a line from Cassiopeia faithfully escorts you to the Great Square of Pegasus.

Many constellations with 3 flashing arrows from the Big Dipper all the way to the Great Square.
Use the 2 stars at the end of the bowl in the Big Dipper to find Polaris. Then use Polaris to find Cassiopeia. From there you can find the Great Square of Pegasus. Chart via Stellarium. Used with permission. Animation by EarthSky.

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Use the Great Square to find the Andromeda Galaxy

Star chart: constellation Andromeda and asterism Great Square with the Andromeda galaxy and stars labeled.
The Great Square of Pegasus can help guide you to the Andromeda Galaxy, the closest spiral galaxy to our Milky Way. Here’s how to do it.

Great Square of Pegasus: A big square of nothing

Often, at events where many are stargazing for the first time, one may hear:

… the Great Square has nothing in it.

But, like all parts of the night sky, the Great Square isn’t really empty. It might look empty to you, because the stars inside the Great Square are so faint. The unaided eye can’t easily detect them. But, if you use binoculars or a small telescope you can easily see many stars within the Great Square.

Also, counting stars inside the Great Square is a good way to determine how dark your sky is when observing.

  • Under light-polluted city skies, you might see no stars inside.
  • Under average rural conditions, you might spot three to five stars.
  • Under pristine dark-sky conditions, you might count up to 30 or more stars inside the square,

1st discovery of an exoplanet orbiting a sunlike star

One of the most famous faint stars near the Great Square is 51 Pegasi. In 1995, astronomers announced in the journal Nature they’d discovered a planet around this star.

This exoplanet is now called 51 Pegasi b (informally Dimidium).

It’s famous as the first confirmed example of a known planet beyond our solar system orbiting a sunlike star.

And today we know there are at least 40 exoplanets in Pegasus, with some 6,300 exoplanets known in our Milky Way galaxy at large.

The astronomers who found 51 Pegasi b – Michel Mayor of the University of Geneva and Didier Queloz at the Cavendish Laboratory and Geneva University – received the 2019 Nobel Prize in Physics for their discovery.

Some books say that 51 Pegasi is visible with the unaided eye. But it’s a challenge. Using binoculars, look roughly halfway between Scheat and Markab in the Great Square of Pegasus. Note that you won’t be able to see any planets! Pegasus 51 is approximately 50 light-years away from Earth.

Star chart of Pegasus showing star names, Greek letter designations, and deep-sky objects.
Learn the stars of Pegasus and where to find its deep-sky targets. Look near the center of this chart for 51 Pegasi. Chart via EarthSky.

Mythology of the Great Square of Pegasus

You might recall that Pegasus was a winged horse in Greek mythology. The constellation Pegasus is one of seven constellations in the autumn sky that explain why it’s never a good idea to claim a mortal’s beauty is greater than that of the gods. You’ll find this story plastered all over the autumn night sky, and Pegasus figures into it prominently.

The story goes that Cassiopeia the Queen bragged that she (or her daughter Andromeda the Princess) was more beautiful than the immortal Nereids, or sea nymphs. This angered the gods, who asked the sea-god Poseidon to take revenge. The punishment was that Cepheus the King and Cassiopeia had to sacrifice Andromeda to Cetus the Whale (sometimes called a sea monster). Andromeda was chained to a rock at sea. She was about to be gobbled up by Cetus, when she saw Perseus the Hero – riding Pegasus the Flying Horse – swooping toward her.

Perseus had a trick up his sleeve. He faced Cetus, holding up the head of the Gorgon Medusa. It’s said the sight of Medusa turned Cetus to stone. Then Perseus whacked the chains that bound Andromeda and freed her. And then, they rode off on Pegasus the Flying Horse and lived happily ever after. Later, Zeus placed all of them in the sky as stars, along with Delphinus the Dolphin, who’d provided comfort to Andromeda.

Star chart with black stars on white of constellation Pegasus with a galaxy as a small red oval.
The Great Square of Pegasus makes up the eastern (left) half of the constellation Pegasus. Image via International Astronomical Union.

In 2026, Saturn and Fomalhaut are near the Great Square

2 telescopes in an open abservatory pointed to the sky with Saturn, Fomalhaut and the Great Square labeled.
Saturn and Fomalhaut are 2 of the brightest objects showing from this all-sky camera taken on August 20, 2026, from inside an observatory in Wyoming. They are below the Great Square of Pegasus. Image via WyoAstro allsky camera. Used with permission.

Bottom line: How to find the Great Square of Pegasus star pattern, and why it’s worth locating in the evening sky.

Read more: Pegasus the Flying Horse, and the best sky story ever

The post Great Square of Pegasus gallops into the autumn sky first appeared on EarthSky.



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Great Square of Pegasus

Throughout late September and October evenings, the Great Square of Pegasus is ascending in the eastern evening sky. Then the Great Square will be high in the sky around the December solstice. And it’ll disappear from the evening sky sometime in February.

The Great Square is an asterism — an obvious pattern of stars — that consists of four stars of nearly equal brightness. Specifically, they are Scheat, Alpheratz, Markab and Algenib. The star Alpheratz is part of the constellation Andromeda and joins with three stars from Pegasus to form the Great Square.

The constellation Pegasus represents a Flying Horse. But the Great Square — the prominent asterism within Pegasus — is a landmark of the Northern Hemisphere’s autumn sky.

Great Square of Pegasus: Sky chart of a sprawing constellation with stars and Great Square labeled.
The Great Square of Pegasus consists of 4 stars of nearly equal brightness: Scheat, Alpheratz, Markab and Algenib. The Great Square is an asterism within the constellation Pegasus. But the star Alpheratz belongs to the constellation Andromeda.

To find the Great Square

To find the Great Square, use the Big Dipper to star-hop to Polaris, the North Star. Then draw an imaginary line from Polaris until you land on the outer star of the W or M-shaped constellation Cassiopeia the Queen.

Finally, a line from Cassiopeia faithfully escorts you to the Great Square of Pegasus.

Many constellations with 3 flashing arrows from the Big Dipper all the way to the Great Square.
Use the 2 stars at the end of the bowl in the Big Dipper to find Polaris. Then use Polaris to find Cassiopeia. From there you can find the Great Square of Pegasus. Chart via Stellarium. Used with permission. Animation by EarthSky.

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Use the Great Square to find the Andromeda Galaxy

Star chart: constellation Andromeda and asterism Great Square with the Andromeda galaxy and stars labeled.
The Great Square of Pegasus can help guide you to the Andromeda Galaxy, the closest spiral galaxy to our Milky Way. Here’s how to do it.

Great Square of Pegasus: A big square of nothing

Often, at events where many are stargazing for the first time, one may hear:

… the Great Square has nothing in it.

But, like all parts of the night sky, the Great Square isn’t really empty. It might look empty to you, because the stars inside the Great Square are so faint. The unaided eye can’t easily detect them. But, if you use binoculars or a small telescope you can easily see many stars within the Great Square.

Also, counting stars inside the Great Square is a good way to determine how dark your sky is when observing.

  • Under light-polluted city skies, you might see no stars inside.
  • Under average rural conditions, you might spot three to five stars.
  • Under pristine dark-sky conditions, you might count up to 30 or more stars inside the square,

1st discovery of an exoplanet orbiting a sunlike star

One of the most famous faint stars near the Great Square is 51 Pegasi. In 1995, astronomers announced in the journal Nature they’d discovered a planet around this star.

This exoplanet is now called 51 Pegasi b (informally Dimidium).

It’s famous as the first confirmed example of a known planet beyond our solar system orbiting a sunlike star.

And today we know there are at least 40 exoplanets in Pegasus, with some 6,300 exoplanets known in our Milky Way galaxy at large.

The astronomers who found 51 Pegasi b – Michel Mayor of the University of Geneva and Didier Queloz at the Cavendish Laboratory and Geneva University – received the 2019 Nobel Prize in Physics for their discovery.

Some books say that 51 Pegasi is visible with the unaided eye. But it’s a challenge. Using binoculars, look roughly halfway between Scheat and Markab in the Great Square of Pegasus. Note that you won’t be able to see any planets! Pegasus 51 is approximately 50 light-years away from Earth.

Star chart of Pegasus showing star names, Greek letter designations, and deep-sky objects.
Learn the stars of Pegasus and where to find its deep-sky targets. Look near the center of this chart for 51 Pegasi. Chart via EarthSky.

Mythology of the Great Square of Pegasus

You might recall that Pegasus was a winged horse in Greek mythology. The constellation Pegasus is one of seven constellations in the autumn sky that explain why it’s never a good idea to claim a mortal’s beauty is greater than that of the gods. You’ll find this story plastered all over the autumn night sky, and Pegasus figures into it prominently.

The story goes that Cassiopeia the Queen bragged that she (or her daughter Andromeda the Princess) was more beautiful than the immortal Nereids, or sea nymphs. This angered the gods, who asked the sea-god Poseidon to take revenge. The punishment was that Cepheus the King and Cassiopeia had to sacrifice Andromeda to Cetus the Whale (sometimes called a sea monster). Andromeda was chained to a rock at sea. She was about to be gobbled up by Cetus, when she saw Perseus the Hero – riding Pegasus the Flying Horse – swooping toward her.

Perseus had a trick up his sleeve. He faced Cetus, holding up the head of the Gorgon Medusa. It’s said the sight of Medusa turned Cetus to stone. Then Perseus whacked the chains that bound Andromeda and freed her. And then, they rode off on Pegasus the Flying Horse and lived happily ever after. Later, Zeus placed all of them in the sky as stars, along with Delphinus the Dolphin, who’d provided comfort to Andromeda.

Star chart with black stars on white of constellation Pegasus with a galaxy as a small red oval.
The Great Square of Pegasus makes up the eastern (left) half of the constellation Pegasus. Image via International Astronomical Union.

In 2026, Saturn and Fomalhaut are near the Great Square

2 telescopes in an open abservatory pointed to the sky with Saturn, Fomalhaut and the Great Square labeled.
Saturn and Fomalhaut are 2 of the brightest objects showing from this all-sky camera taken on August 20, 2026, from inside an observatory in Wyoming. They are below the Great Square of Pegasus. Image via WyoAstro allsky camera. Used with permission.

Bottom line: How to find the Great Square of Pegasus star pattern, and why it’s worth locating in the evening sky.

Read more: Pegasus the Flying Horse, and the best sky story ever

The post Great Square of Pegasus gallops into the autumn sky first appeared on EarthSky.



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The equinox sun rises due east and sets due west

Line drawing of hemisphere with slanted half-circle on it and stick figure in middle.
Where does the celestial equator intersect your horizon? ALWAYS at points due east and due west. And the equinox sun is on the celestial equator. That’s why the equinox sun rises due east and due west. Image via Physics.csbsju.edu.

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This year’s September equinox will fall at 00:05 UTC on September 23, 2026. That’s 19:05 p.m. CDT on September 22.

The equinox sun rises due east and sets due west

The sun rises due east and sets due west at the equinox. It might seem counterintuitive. But it’s true no matter where you live on Earth (except at the North and South Poles). Here’s how to visualize it.

To understand the nearly due-east and due-west rising and setting of an equinox sun, you have to think of the reality of Earth in space. First think about why the sun’s path across our sky shifts from season to season. That’s because our world is tilted on its axis with respect to its orbit around the sun.

Now think about what an equinox is. It’s a milestone in Earth’s orbit around the sun. And it’s also an event that happens on the imaginary dome of Earth’s sky. It marks that special moment when the sun crosses the celestial equator — an imaginary line your sky, directly above Earth’s equator. In the case of the September equinox, the sun is moving from north to south, bringing spring and summer to the Southern Hemisphere and fall and winter to the Northern Hemisphere.

So the celestial equator is a great circle dividing the imaginary celestial sphere into its northern and southern halves.

It’s an imaginary line, yet what happens at every equinox is very real. It’s as real as the sun’s passage across your sky each day, and as real as the change of seasons.

Diagram: Sun in center with 4 Earths around it, with different faces lit by sunlight.
Our seasons result from the Earth’s spin axis tilting 23.5 degrees out of the perpendicular to the ecliptic, or Earth’s orbital plane. Image via National Weather Service/ weather.gov.

It’s the same all over the globe

So no matter where you are on Earth (except for the North and South Poles), you have a due east and due west point on your horizon. That point marks the intersection of your horizon with the celestial equator, the imaginary great circle above the true equator of Earth.

And that’s why the sun rises close to due east and sets close to due west, for all of us, at the equinox. The equinox sun is on the celestial equator. Which means, no matter where you are on Earth, the celestial equator intersects your horizon at due east and due west.

This fact makes the day of an equinox a good day for finding east and west from your yard or favorite site for watching the sky. Just go outside around sunset or sunrise and notice the location of the sun on the horizon with respect to familiar landmarks.

If you do this, you’ll be able to use those landmarks to find those cardinal directions in the weeks and months ahead. Plus, you’ll know those directions long after Earth has moved on in its orbit around the sun.

Equinox sun: A low mountain on the horizon, with the rising sun on 11 different positions relative to the mountain.
View at EarthSky Community Photos. | How fast is daytime growing around the equinox? Rupesh Sangoi in Mumbai, India, captured separate images of the sunrise, showing the sun’s movement along the horizon, between the June and December solstices and on the equinoxes. Rupesh wrote: “Did this for over a year, at sunrise.” Glorious composite, Rupesh! Thank you.

Bottom line: The 2026 September equinox occurs at 00:05 UTC on September 23, 2026. That’s 19:05 p.m. CDT on September 22. And the equinox sun rises and sets due east and due west.

Are day and night equal on the equinox?

It’s aurora season. Why more auroras at equinoxes?

Equinox sun above the horizon all day at the poles

The post The equinox sun rises due east and sets due west first appeared on EarthSky.



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Line drawing of hemisphere with slanted half-circle on it and stick figure in middle.
Where does the celestial equator intersect your horizon? ALWAYS at points due east and due west. And the equinox sun is on the celestial equator. That’s why the equinox sun rises due east and due west. Image via Physics.csbsju.edu.

Science news, night sky events and beautiful photos, all in one place. Click here to subscribe to EarthSky’s free daily newsletter.

This year’s September equinox will fall at 00:05 UTC on September 23, 2026. That’s 19:05 p.m. CDT on September 22.

The equinox sun rises due east and sets due west

The sun rises due east and sets due west at the equinox. It might seem counterintuitive. But it’s true no matter where you live on Earth (except at the North and South Poles). Here’s how to visualize it.

To understand the nearly due-east and due-west rising and setting of an equinox sun, you have to think of the reality of Earth in space. First think about why the sun’s path across our sky shifts from season to season. That’s because our world is tilted on its axis with respect to its orbit around the sun.

Now think about what an equinox is. It’s a milestone in Earth’s orbit around the sun. And it’s also an event that happens on the imaginary dome of Earth’s sky. It marks that special moment when the sun crosses the celestial equator — an imaginary line your sky, directly above Earth’s equator. In the case of the September equinox, the sun is moving from north to south, bringing spring and summer to the Southern Hemisphere and fall and winter to the Northern Hemisphere.

So the celestial equator is a great circle dividing the imaginary celestial sphere into its northern and southern halves.

It’s an imaginary line, yet what happens at every equinox is very real. It’s as real as the sun’s passage across your sky each day, and as real as the change of seasons.

Diagram: Sun in center with 4 Earths around it, with different faces lit by sunlight.
Our seasons result from the Earth’s spin axis tilting 23.5 degrees out of the perpendicular to the ecliptic, or Earth’s orbital plane. Image via National Weather Service/ weather.gov.

It’s the same all over the globe

So no matter where you are on Earth (except for the North and South Poles), you have a due east and due west point on your horizon. That point marks the intersection of your horizon with the celestial equator, the imaginary great circle above the true equator of Earth.

And that’s why the sun rises close to due east and sets close to due west, for all of us, at the equinox. The equinox sun is on the celestial equator. Which means, no matter where you are on Earth, the celestial equator intersects your horizon at due east and due west.

This fact makes the day of an equinox a good day for finding east and west from your yard or favorite site for watching the sky. Just go outside around sunset or sunrise and notice the location of the sun on the horizon with respect to familiar landmarks.

If you do this, you’ll be able to use those landmarks to find those cardinal directions in the weeks and months ahead. Plus, you’ll know those directions long after Earth has moved on in its orbit around the sun.

Equinox sun: A low mountain on the horizon, with the rising sun on 11 different positions relative to the mountain.
View at EarthSky Community Photos. | How fast is daytime growing around the equinox? Rupesh Sangoi in Mumbai, India, captured separate images of the sunrise, showing the sun’s movement along the horizon, between the June and December solstices and on the equinoxes. Rupesh wrote: “Did this for over a year, at sunrise.” Glorious composite, Rupesh! Thank you.

Bottom line: The 2026 September equinox occurs at 00:05 UTC on September 23, 2026. That’s 19:05 p.m. CDT on September 22. And the equinox sun rises and sets due east and due west.

Are day and night equal on the equinox?

It’s aurora season. Why more auroras at equinoxes?

Equinox sun above the horizon all day at the poles

The post The equinox sun rises due east and sets due west first appeared on EarthSky.



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Scientists discover a new tiger cat hiding in plain sight

Tiger cat: Small, brown feline with black spots all over its body and large, brown eyes.
A member of the newly discovered tiger cat species — Leopardus tilcayo — at La Senda Verde, a private wildlife refuge in the Yungas region of Bolivia. This little cat, a male, was previously kept by a local family. Image via Allesandro Verniani/ Wikimedia Commons.

For decades, scientists struggled to sort out South America’s tiger cats. Now, using whole-genome data from 38 individuals, including museum specimens, researchers have found that what scientists once treated as a single group actually contains five distinct species.

And they’ve identified and formally described a new tiger cat species, Leopardus tilcayo.

It’s the first new living cat species formally recognized in more than a century. The researchers estimate that the L. tilcayo lineage diverged from other tiger cats about 1.4 million years ago. It is known from Bolivia’s Yungas region, a mountainous area on the eastern slopes of the Andes, where forests connect the high Andes with the Amazon. The area is difficult to explore, but rich in wildlife.

The journal Current Biology published their peer-reviewed findings on September 17, 2026.

The new cat is from Bolivia

How did they notice it? A local family in Bolivia’s Yungas region found a little spotted cat and initially thought it was a domestic cat. They kept it for about a year before giving it to the Senda Verde wildlife refuge when its wild behavior became apparent. Local people already knew cats like it, calling them tilcayos. At the refuge, biologist Paola Nogales-Ascarrunz noticed that something about the little cat didn’t look quite right. Her curiosity eventually led to the new study and the formal recognition of a new species.

The newly recognized species, Leopardus tilcayo, takes its name from the local name for the cat.

So the cat wasn’t new to the people who lived in the Yungas. It was new to science. Tiger cat is a common name for several species of small spotted wild cats in the genus Leopardus in Central and South America.

They’re little cats — roughly housecat-sized or smaller — covered in spots and rosettes. They can look remarkably similar, even when they come from very different parts of the continent. That’s why scientists call them a cryptic species complex: visually similar animals that turn out to represent genetically distinct evolutionary lineages.

The new species is about 18 inches (46 centimeters) long from its head to the base of its tail. It weighs around 3 pounds (1.4 kilograms). Nogales-Ascarrunz, who is a co-author of the new study, told Reuters:

Its fur is light brown … with irregularly shaped rosettes across its body.

Small feline, but with a rather thick tail for its size. Its paws are also quite broad in comparison.
Tiger cats were once seen as one species, but DNA research now shows they are actually 5 distinct species, including 1 newly identified species: Leopardus tilcayo. Image via Alessandro Verniani/ Wikipedia.

Why didn’t we know until now?

The cat’s appearance helped hide its separate species status for so long. Leopardus tilcayo looks a lot like other tiger cats. Simply looking at its coat or body shape does not make its separate identity obvious. So the researchers turned to DNA, comparing the genomes of 38 tiger cats from different parts of South and Central America. A genome is an organism’s complete set of genetic information. By comparing genomes, scientists can see how closely related different animals are and identify populations that have followed separate evolutionary paths.

The results showed that the five tiger cat species are genetically distinct. Evolutionary biologist Jonas Lescroart told Reuters:

We never expected this Bolivian tiger cat to be a separate species, and no one had ever proposed it as a different animal, subspecies or otherwise.

The study also identifies a new subspecies in Peru, Leopardus tigrinus antisuyo. A subspecies is a distinct population within a species that has developed consistent differences from other populations.

Four known species and one new one

The five species recognized in the study are:

Leopardus tigrinus, Leopardus guttulus, Leopardus emiliae, Leopardus pardinoides and Leopardus tilcayo.

Assuming the researchers are correct, and the lineage leading to L. tilcayo separated from its closest relatives about 1.4 million years ago, the Bolivian cat didn’t recently become different from its relatives. It has been following its own evolutionary path for a very long time.

Animal looking upward, viewed from the side. It has thick, white whiskers.
The newly identified species is a small wild cat from Bolivia’s Yungas. It marks the 1st formally recognized living cat species in over a century. Scientists overlooked the species because it closely resembles other tiger cats. Image via Alessandro Verniani/ Wikipedia.

Old museum specimens helped

The researchers didn’t rely only on animals sampled recently in the wild. Eight of the 38 tiger cats included in the study came from natural history museum collections, and some of those specimens had been collected decades ago.

Today, scientists can sometimes recover DNA from preserved museum specimens and compare it with genetic material from living animals.

This approach is known as museomics, or using museum collections and modern genetic techniques to answer questions about biodiversity.

In this case, those old specimens helped researchers piece together the evolutionary history of tiger cats across their ranges. The team combined them with samples from countries including Bolivia, Peru, Brazil, Colombia, Venezuela, Guyana, Suriname and Costa Rica.

A name is a beginning

Recognizing Leopardus tilcayo as a species is a first step. Researchers still need to find out how widely the cat occurs, how many individuals live in the wild and what threats it faces.

But we don’t yet know much about the tilcayo itself. The researchers have very little direct information about its abundance, reproduction or behavior. Camera-trap evidence suggests nocturnal activity, and rodent remains have been found in scat. Other observations and camera-trap records have provided clues about the species, but much remains unknown.

That uncertainty matters because the Yungas region of Bolivia faces increasing pressure from human activities.

A species can also appear more common than it really is when it is counted together with other animal look-alikes. Now that scientists can separate the five tiger cats, they can begin assessing each one on its own.

Animal inside a fence, with its paw outside and touching the camera. The paws are quite big.
The newly identified tilcayo tiger cat has been evolving separately from its relatives for about 1.4 million years. What looks familiar may still hold a secret. Thanks to modern technology, scientists are uncovering wildlife we never knew was there and gaining a chance to protect it before it’s too late. Image via Alessandro Verniani/ Wikipedia.

The discovery changes the conservation picture

So the newly recognized tiger cat lineages can now be assessed individually. And the researchers have shared their findings with the International Union for Conservation of Nature, or IUCN, which maintains the world’s major Red List, of threatened species.

And now conservation scientists have a more accurate picture of where each tiger cat species lives and can begin assessing how large each population might be and what threats it faces.

So the story of Leopardus tilcayo isn’t just about finding a new name for a small cat. It shows how scientists can uncover hidden biodiversity by combining information from the past with modern genetic tools. A cat that looked familiar had been living in the forests of Bolivia all along.

Now science has a better understanding of what it is.

Bottom line: A newly identified South American tiger cat is the first cat species discovered in a century. Scientists studying tiger cats have found five distinct species, revealing more diversity among these familiar-looking wild cats than previously known.

Source: Phylogenomics and museomics reveal five distinct species of tiger cats in South America

Via Universidad de Antioquia

Via Reuters

Read more: How the lynx beat extinction: Lifeform of the week

Read more: Meet the snow leopard: the ghost of the mountains

The post Scientists discover a new tiger cat hiding in plain sight first appeared on EarthSky.



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Tiger cat: Small, brown feline with black spots all over its body and large, brown eyes.
A member of the newly discovered tiger cat species — Leopardus tilcayo — at La Senda Verde, a private wildlife refuge in the Yungas region of Bolivia. This little cat, a male, was previously kept by a local family. Image via Allesandro Verniani/ Wikimedia Commons.

For decades, scientists struggled to sort out South America’s tiger cats. Now, using whole-genome data from 38 individuals, including museum specimens, researchers have found that what scientists once treated as a single group actually contains five distinct species.

And they’ve identified and formally described a new tiger cat species, Leopardus tilcayo.

It’s the first new living cat species formally recognized in more than a century. The researchers estimate that the L. tilcayo lineage diverged from other tiger cats about 1.4 million years ago. It is known from Bolivia’s Yungas region, a mountainous area on the eastern slopes of the Andes, where forests connect the high Andes with the Amazon. The area is difficult to explore, but rich in wildlife.

The journal Current Biology published their peer-reviewed findings on September 17, 2026.

The new cat is from Bolivia

How did they notice it? A local family in Bolivia’s Yungas region found a little spotted cat and initially thought it was a domestic cat. They kept it for about a year before giving it to the Senda Verde wildlife refuge when its wild behavior became apparent. Local people already knew cats like it, calling them tilcayos. At the refuge, biologist Paola Nogales-Ascarrunz noticed that something about the little cat didn’t look quite right. Her curiosity eventually led to the new study and the formal recognition of a new species.

The newly recognized species, Leopardus tilcayo, takes its name from the local name for the cat.

So the cat wasn’t new to the people who lived in the Yungas. It was new to science. Tiger cat is a common name for several species of small spotted wild cats in the genus Leopardus in Central and South America.

They’re little cats — roughly housecat-sized or smaller — covered in spots and rosettes. They can look remarkably similar, even when they come from very different parts of the continent. That’s why scientists call them a cryptic species complex: visually similar animals that turn out to represent genetically distinct evolutionary lineages.

The new species is about 18 inches (46 centimeters) long from its head to the base of its tail. It weighs around 3 pounds (1.4 kilograms). Nogales-Ascarrunz, who is a co-author of the new study, told Reuters:

Its fur is light brown … with irregularly shaped rosettes across its body.

Small feline, but with a rather thick tail for its size. Its paws are also quite broad in comparison.
Tiger cats were once seen as one species, but DNA research now shows they are actually 5 distinct species, including 1 newly identified species: Leopardus tilcayo. Image via Alessandro Verniani/ Wikipedia.

Why didn’t we know until now?

The cat’s appearance helped hide its separate species status for so long. Leopardus tilcayo looks a lot like other tiger cats. Simply looking at its coat or body shape does not make its separate identity obvious. So the researchers turned to DNA, comparing the genomes of 38 tiger cats from different parts of South and Central America. A genome is an organism’s complete set of genetic information. By comparing genomes, scientists can see how closely related different animals are and identify populations that have followed separate evolutionary paths.

The results showed that the five tiger cat species are genetically distinct. Evolutionary biologist Jonas Lescroart told Reuters:

We never expected this Bolivian tiger cat to be a separate species, and no one had ever proposed it as a different animal, subspecies or otherwise.

The study also identifies a new subspecies in Peru, Leopardus tigrinus antisuyo. A subspecies is a distinct population within a species that has developed consistent differences from other populations.

Four known species and one new one

The five species recognized in the study are:

Leopardus tigrinus, Leopardus guttulus, Leopardus emiliae, Leopardus pardinoides and Leopardus tilcayo.

Assuming the researchers are correct, and the lineage leading to L. tilcayo separated from its closest relatives about 1.4 million years ago, the Bolivian cat didn’t recently become different from its relatives. It has been following its own evolutionary path for a very long time.

Animal looking upward, viewed from the side. It has thick, white whiskers.
The newly identified species is a small wild cat from Bolivia’s Yungas. It marks the 1st formally recognized living cat species in over a century. Scientists overlooked the species because it closely resembles other tiger cats. Image via Alessandro Verniani/ Wikipedia.

Old museum specimens helped

The researchers didn’t rely only on animals sampled recently in the wild. Eight of the 38 tiger cats included in the study came from natural history museum collections, and some of those specimens had been collected decades ago.

Today, scientists can sometimes recover DNA from preserved museum specimens and compare it with genetic material from living animals.

This approach is known as museomics, or using museum collections and modern genetic techniques to answer questions about biodiversity.

In this case, those old specimens helped researchers piece together the evolutionary history of tiger cats across their ranges. The team combined them with samples from countries including Bolivia, Peru, Brazil, Colombia, Venezuela, Guyana, Suriname and Costa Rica.

A name is a beginning

Recognizing Leopardus tilcayo as a species is a first step. Researchers still need to find out how widely the cat occurs, how many individuals live in the wild and what threats it faces.

But we don’t yet know much about the tilcayo itself. The researchers have very little direct information about its abundance, reproduction or behavior. Camera-trap evidence suggests nocturnal activity, and rodent remains have been found in scat. Other observations and camera-trap records have provided clues about the species, but much remains unknown.

That uncertainty matters because the Yungas region of Bolivia faces increasing pressure from human activities.

A species can also appear more common than it really is when it is counted together with other animal look-alikes. Now that scientists can separate the five tiger cats, they can begin assessing each one on its own.

Animal inside a fence, with its paw outside and touching the camera. The paws are quite big.
The newly identified tilcayo tiger cat has been evolving separately from its relatives for about 1.4 million years. What looks familiar may still hold a secret. Thanks to modern technology, scientists are uncovering wildlife we never knew was there and gaining a chance to protect it before it’s too late. Image via Alessandro Verniani/ Wikipedia.

The discovery changes the conservation picture

So the newly recognized tiger cat lineages can now be assessed individually. And the researchers have shared their findings with the International Union for Conservation of Nature, or IUCN, which maintains the world’s major Red List, of threatened species.

And now conservation scientists have a more accurate picture of where each tiger cat species lives and can begin assessing how large each population might be and what threats it faces.

So the story of Leopardus tilcayo isn’t just about finding a new name for a small cat. It shows how scientists can uncover hidden biodiversity by combining information from the past with modern genetic tools. A cat that looked familiar had been living in the forests of Bolivia all along.

Now science has a better understanding of what it is.

Bottom line: A newly identified South American tiger cat is the first cat species discovered in a century. Scientists studying tiger cats have found five distinct species, revealing more diversity among these familiar-looking wild cats than previously known.

Source: Phylogenomics and museomics reveal five distinct species of tiger cats in South America

Via Universidad de Antioquia

Via Reuters

Read more: How the lynx beat extinction: Lifeform of the week

Read more: Meet the snow leopard: the ghost of the mountains

The post Scientists discover a new tiger cat hiding in plain sight first appeared on EarthSky.



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Newly formed moon crater is once-in-a-century discovery

Cratered moonscape from orbit, then a huge crater with white rays around it.
Sometime between April 11 and May 22, 2024, a comet or asteroid the size of a 3- to 6-story building hit the moon. But we didn’t know about it until someone scanning Lunar Reconnaissance Orbiter maps spotted it. It’s the largest newly formed crater yet found in the solar system. The newly formed moon crater has been named McGetchin Crater. Image via NASA/ GSFC/ Intuitive Machines.
  • NASA’s Lunar Reconnaissance Orbiter has spotted a new lunar crater. It’s the largest newly formed crater yet found in the solar system.
  • The crater formed between April 11 and May 22, 2024, when a rock the size of a 3- to 6-story building hit the moon. It’s about 728 feet wide and 141 feet deep (222 m wide and 43 m deep). This size of lunar impact only occurs about once a century or longer.
  • The impact disturbed the lunar soil over a much larger area. It created a 4-mile-wide zone (6.4 km) that is about 16 F (8.8 C) colder at night because the loosened soil doesn’t retain heat as well.

NASA published this original story on September 16, 2026. Edits by EarthSky.

You deserve a daily dose of good news. For the latest in science and the night sky, subscribe to EarthSky’s free daily newsletter.

Newly formed moon crater is once-in-a-century discovery

It started as a routine data-quality check. But as Robert Wagner – an image processing specialist with NASA’s Lunar Reconnaissance Orbiter (LRO) – scanned a giant moon map on his computer screen, an unusually large bright spot circled by a dark halo caught his eye. It implied that surface material in that area had been shaken up. He said:

I just stopped, dropped everything, and started looking into what that spot was.

By comparing before and after images of the moon, Wagner realized he had discovered the largest newly formed crater ever found in the solar system. This discovery highlights the value of NASA’s moon orbiter data in studying a dynamic landscape as the agency advances a sustained human presence and expanded scientific and commercial activity on the moon.

It was officially named McGetchin after pioneering lunar scientist Tom McGetchin. The crater formed on the moon’s eastern edge sometime between April 11 and May 22, 2024, after a comet or asteroid the size of a three- to six-story building hit the surface.

The crash left a crater 728 feet (222 meters) wide, spanning the length of two football fields. And at 141 feet (43 meters) deep, the crater could fit three vertically stacked yellow school buses.

Scientists estimate that an impact of this magnitude happens on the moon about once in a century or even longer.

The researchers published two papers on the crater. The first was published by Science Advances on September 16, 2026. The peer-reviewed Science Advances also published the second paper on September 16, 2026.

The moon takes some hits

The Lunar Reconnaissance Orbiter has been circling the moon for more than 17 years. It uses its seven instruments to map the topography, surface composition, temperature and radiation environment there. The spacecraft’s team has identified at least 1,000 new impact craters throughout the mission and flagged 100,000 more surface changes from an object smashing into the moon or from the debris that flung out after.

With no atmosphere to slow them or burn them up, space rocks and other objects easily reach the lunar surface. Most are much smaller compared to the object that carved out McGetchin crater. The smallest craters scientists can distinguish from LRO images are about 30 feet wide, the length of a three-story building laid on its side. The rocks that make those craters are about 43 inches wide (110 cm), the size of a monster-truck tire. Scientists estimate that impacts of this scale produce about 140 new craters across the moon each year. But most new ones are from microscopic projectiles that leave holes too small to identify in orbital images.

What a cool impact!

With its numerous instruments, the spacecraft can observe changes to the lunar surface that aren’t apparent in the Orbiter’s images alone. After the crater discovery, scientists working with the craft’s thermal instrument, Diviner, made follow-up observations of the site. They found a 4-mile-wide area around the crater that is about 16 degrees F (8.8 C) cooler at night than its surroundings.

Researchers said the cooling happens because the impact fluffs up the regolith around the crater, making it less dense and therefore less able to retain heat. The large extent of this “cold spot” is striking, scientists said, because it shows that impacts can modify the moon’s surface far beyond the crater itself. These physical changes could affect how rover wheels interact with the surface, for instance.

Orbital moonscape in blue, with a dark blue ring with a white center popping into existence.
View of before the formation of McGetchin Crater on the moon’s eastern limb and after. The Lunar Reconnaissance Orbiter’s thermal instrument, Diviner, captured the 2 images. Experts are calling this a once-in-a-century collision. The dark blue shows a “cold spot,” which happens because an impact fluffs up regolith around a crater, making it less dense. Therefore it’s less able to retain heat. Image via NASA Goddard/ UCLA/ JHU APL.

Road to discovery of newly formed moon crater

The Lunar Reconnaissance Orbiter collects images from about 60 miles (96 km) above the moon as it loops from pole to pole. The system includes two cameras that capture high-resolution black-and-white images and one camera for moderate-resolution multispectral images. Over the years and thousands of passes, scientists have built maps detailed enough to spot not only new craters, but also landslides, landers, seismic faults and even hints of lava tubes.

Mission scientists regularly analyze close-up images of small portions of the moon’s surface from the Narrow-Angle Camera. Using these images, they look for changes that are typically less than 30 feet across. But every few years the team searches for large (wider than 150 feet) features by creating global moon maps and comparing them to older versions.

That’s what Wagner was doing on October 24, 2025, when he came across McGetchin. Using images from the Orbiter’s Wide-Angle Camera – which captures broad views with pixels the size of football fields – he stacked hundreds of “before” and “after” frames with software designed to highlight change. Anything that stayed the same turned gray while anything different showed up as bright or dark patches.

One spot stood out

While the process sounds straightforward, spotting real craters requires a lot of manual work. The software flags every tiny shift in lighting or shadow, generating hundreds of false alarms. For this reason, Wagner typically verifies the software, looking for small fuzzy halos around pixel-wide bright points. These indicate splashes of regolith around a new crater.

Spanning hundreds of pixels, McGetchin stood out immediately. Wagner said:

It was by far the most obvious impact debris pattern I’ve ever seen in one of these images.

After his discovery, scientists turned to the Narrow-Angle Camera, which takes much sharper views at about 3 feet per pixel. This camera’s close-up images, taken as LRO flew over the impact site again, revealed the crater size, shape and how the surrounding terrain was affected. These images also helped researchers estimate the size and force of the rock fragment that formed the new crater, details that should appear in a future paper.

Bottom line: Sometime in early 2024, a space rock slammed into the moon, creating a brand new crater in the lunar surface. The newly formed moon crater is about 728 feet wide and 141 feet deep.

Source: A new 222-m diameter lunar crater

Source: New lunar crater reveals extensive distal regolith modification

Via NASA

Read more: Asteroid 2024 YR4 won’t hit the moon after all

The post Newly formed moon crater is once-in-a-century discovery first appeared on EarthSky.



from EarthSky https://ift.tt/HjNp136
Cratered moonscape from orbit, then a huge crater with white rays around it.
Sometime between April 11 and May 22, 2024, a comet or asteroid the size of a 3- to 6-story building hit the moon. But we didn’t know about it until someone scanning Lunar Reconnaissance Orbiter maps spotted it. It’s the largest newly formed crater yet found in the solar system. The newly formed moon crater has been named McGetchin Crater. Image via NASA/ GSFC/ Intuitive Machines.
  • NASA’s Lunar Reconnaissance Orbiter has spotted a new lunar crater. It’s the largest newly formed crater yet found in the solar system.
  • The crater formed between April 11 and May 22, 2024, when a rock the size of a 3- to 6-story building hit the moon. It’s about 728 feet wide and 141 feet deep (222 m wide and 43 m deep). This size of lunar impact only occurs about once a century or longer.
  • The impact disturbed the lunar soil over a much larger area. It created a 4-mile-wide zone (6.4 km) that is about 16 F (8.8 C) colder at night because the loosened soil doesn’t retain heat as well.

NASA published this original story on September 16, 2026. Edits by EarthSky.

You deserve a daily dose of good news. For the latest in science and the night sky, subscribe to EarthSky’s free daily newsletter.

Newly formed moon crater is once-in-a-century discovery

It started as a routine data-quality check. But as Robert Wagner – an image processing specialist with NASA’s Lunar Reconnaissance Orbiter (LRO) – scanned a giant moon map on his computer screen, an unusually large bright spot circled by a dark halo caught his eye. It implied that surface material in that area had been shaken up. He said:

I just stopped, dropped everything, and started looking into what that spot was.

By comparing before and after images of the moon, Wagner realized he had discovered the largest newly formed crater ever found in the solar system. This discovery highlights the value of NASA’s moon orbiter data in studying a dynamic landscape as the agency advances a sustained human presence and expanded scientific and commercial activity on the moon.

It was officially named McGetchin after pioneering lunar scientist Tom McGetchin. The crater formed on the moon’s eastern edge sometime between April 11 and May 22, 2024, after a comet or asteroid the size of a three- to six-story building hit the surface.

The crash left a crater 728 feet (222 meters) wide, spanning the length of two football fields. And at 141 feet (43 meters) deep, the crater could fit three vertically stacked yellow school buses.

Scientists estimate that an impact of this magnitude happens on the moon about once in a century or even longer.

The researchers published two papers on the crater. The first was published by Science Advances on September 16, 2026. The peer-reviewed Science Advances also published the second paper on September 16, 2026.

The moon takes some hits

The Lunar Reconnaissance Orbiter has been circling the moon for more than 17 years. It uses its seven instruments to map the topography, surface composition, temperature and radiation environment there. The spacecraft’s team has identified at least 1,000 new impact craters throughout the mission and flagged 100,000 more surface changes from an object smashing into the moon or from the debris that flung out after.

With no atmosphere to slow them or burn them up, space rocks and other objects easily reach the lunar surface. Most are much smaller compared to the object that carved out McGetchin crater. The smallest craters scientists can distinguish from LRO images are about 30 feet wide, the length of a three-story building laid on its side. The rocks that make those craters are about 43 inches wide (110 cm), the size of a monster-truck tire. Scientists estimate that impacts of this scale produce about 140 new craters across the moon each year. But most new ones are from microscopic projectiles that leave holes too small to identify in orbital images.

What a cool impact!

With its numerous instruments, the spacecraft can observe changes to the lunar surface that aren’t apparent in the Orbiter’s images alone. After the crater discovery, scientists working with the craft’s thermal instrument, Diviner, made follow-up observations of the site. They found a 4-mile-wide area around the crater that is about 16 degrees F (8.8 C) cooler at night than its surroundings.

Researchers said the cooling happens because the impact fluffs up the regolith around the crater, making it less dense and therefore less able to retain heat. The large extent of this “cold spot” is striking, scientists said, because it shows that impacts can modify the moon’s surface far beyond the crater itself. These physical changes could affect how rover wheels interact with the surface, for instance.

Orbital moonscape in blue, with a dark blue ring with a white center popping into existence.
View of before the formation of McGetchin Crater on the moon’s eastern limb and after. The Lunar Reconnaissance Orbiter’s thermal instrument, Diviner, captured the 2 images. Experts are calling this a once-in-a-century collision. The dark blue shows a “cold spot,” which happens because an impact fluffs up regolith around a crater, making it less dense. Therefore it’s less able to retain heat. Image via NASA Goddard/ UCLA/ JHU APL.

Road to discovery of newly formed moon crater

The Lunar Reconnaissance Orbiter collects images from about 60 miles (96 km) above the moon as it loops from pole to pole. The system includes two cameras that capture high-resolution black-and-white images and one camera for moderate-resolution multispectral images. Over the years and thousands of passes, scientists have built maps detailed enough to spot not only new craters, but also landslides, landers, seismic faults and even hints of lava tubes.

Mission scientists regularly analyze close-up images of small portions of the moon’s surface from the Narrow-Angle Camera. Using these images, they look for changes that are typically less than 30 feet across. But every few years the team searches for large (wider than 150 feet) features by creating global moon maps and comparing them to older versions.

That’s what Wagner was doing on October 24, 2025, when he came across McGetchin. Using images from the Orbiter’s Wide-Angle Camera – which captures broad views with pixels the size of football fields – he stacked hundreds of “before” and “after” frames with software designed to highlight change. Anything that stayed the same turned gray while anything different showed up as bright or dark patches.

One spot stood out

While the process sounds straightforward, spotting real craters requires a lot of manual work. The software flags every tiny shift in lighting or shadow, generating hundreds of false alarms. For this reason, Wagner typically verifies the software, looking for small fuzzy halos around pixel-wide bright points. These indicate splashes of regolith around a new crater.

Spanning hundreds of pixels, McGetchin stood out immediately. Wagner said:

It was by far the most obvious impact debris pattern I’ve ever seen in one of these images.

After his discovery, scientists turned to the Narrow-Angle Camera, which takes much sharper views at about 3 feet per pixel. This camera’s close-up images, taken as LRO flew over the impact site again, revealed the crater size, shape and how the surrounding terrain was affected. These images also helped researchers estimate the size and force of the rock fragment that formed the new crater, details that should appear in a future paper.

Bottom line: Sometime in early 2024, a space rock slammed into the moon, creating a brand new crater in the lunar surface. The newly formed moon crater is about 728 feet wide and 141 feet deep.

Source: A new 222-m diameter lunar crater

Source: New lunar crater reveals extensive distal regolith modification

Via NASA

Read more: Asteroid 2024 YR4 won’t hit the moon after all

The post Newly formed moon crater is once-in-a-century discovery first appeared on EarthSky.



from EarthSky https://ift.tt/HjNp136

Yes, there’s an aurora season, and it’s here

Bright pink and green auroras in the background, and a small church in the foreground.
View at EarthSky Community Photos. | JD Smith in Clay County, Minnesota, caught this beautiful image on November 12, 2025. Thank you, JD! Auroras are more frequent around the equinoxes. But why? Read about the aurora season below.

Science news, night sky events and beautiful photos, all in one place. Click here to subscribe to our free daily newsletter.

When is aurora season?

Yes, there is an aurora season, which comes around the fall and spring equinox each year. This pattern in nature – auroras increasing twice a year – has been known to scientists for more than a century.

We know that storms and eruptions on the sun cause disturbances in Earth’s magnetic field called geomagnetic storms. And we know the sun itself has cycles, including the famous 11-year solar cycle. That cycle appears to have peaked in late 2024, and the sun is still relatively active.

But an 11-year cycle is not a twice-yearly cycle. Why would geomagnetic storms increase twice a year?

As it turns out, it’s all about magnetism, geometry and something called the Russell-McPherron effect.

Read more: Forms of aurora: Arcs, curtains, coronas and more

Aurora season: Early studies

And it’s something nature-watchers have studied for a long time. Aloysius Cortie, an English Jesuit astronomer who conducted sun studies around the turn of the last century, published the first notable journal paper on the link between equinoxes and auroras in the year 1912.

Then, in 1940, the mathematician Sydney Chapman and his German colleague Julius Bartels included another discussion of the twice-yearly aurora season in their classic book Geomagnetism. This book became the standard textbook on Earth’s magnetism for several decades.

Later, a solar physicist – David Hathaway of NASA’s Marshall Space Flight Center in Huntsville, Alabama – created an updated plot showing the same seasonal pattern. Hathaway’s plot is below:

Graph with 12 bars with 2 peaks at months 3-4 and 9-10.
David Hathaway of NASA created an updated plot showing a seasonal variation in Earth’s magnetic storms, similar to the one that had been published in 1940. This one shows geomagnetic activity from 1932 to 2002. It shows a twice-a-year increase in the geomagnetic storms that cause auroras. Image via David Hathaway. Used with permission.

The Russell-McPherron effect

Over the years, scientist put forth several models to explain the twice-a-year variation in geomagnetic storms. An enduring explanation comes from Christopher Russell and Robert McPherron, both of UCLA. Their 1973 paper on the subject was titled Semiannual variation of geomagnetic activity.

Although their model explaining the seasonal variation in aurora frequency didn’t explain everything perfectly, it did show a physical connection between the geometry of Earth’s magnetic field and the magnetic field carried to Earth from the sun by the solar wind. And that is why, since the 1973 paper, the term Russell-McPherron effect has been used for seasonal auroras.

Streaks of aurora stretching upward, covering the sky, greenish at bottom with shades of red and pink above.
View at EarthSky Community Photos. | Robynanne Cash-Howard captured these auroras in Highbridge, Wisconsin, on November 12, 2025. Thank you, Robynanne!

So what’s the connection?

The Bz component. You know how a magnet always comes with two poles: a north pole and a south pole? Solar magnetic fields – carried to Earth via the solar wind – also have a north and south pole. Russell and McPherron showed that the “north-south” component of the sun’s magnetic field – called the Bz component by solar physicists – goes up and down over the year, in a way corresponding to the wobbling of Earth’s axis. They showed these fluctuations are largest during the equinoxes. Geomagnetic storms – and therefore auroras – happen most often when the “north-south” component of the solar wind is more or less opposite the “north-south” component of Earth’s own magnetic field.

It happens because – just as when two bar magnets oriented oppositely attract one another – so opposite Bz components attract. They open up a hole in Earth’s magnetic field, which allows the solar wind to flow more easily toward Earth’s magnetic poles.

When this happens, presto, we have auroras!

Check here for EarthSky’s daily sun news.

Sun and Earth with magnetic field between them and labeled arrows sticking out of Earth.
Sun on the left, Earth on the right. Not to scale. The sun’s magnetic field – carried by the solar wind – is between them. Note that the Bx and By components are oriented parallel to the ecliptic (Earth-sun plane). The 3rd component, called the Bz component, is perpendicular to the ecliptic. Geomagnetic storms – and therefore auroras – happen most often when the Bz component of the solar wind is more or less opposite the Bz component of Earth’s own magnetic field. The tilt of the Earth in relationship to the Earth-sun plane – around the time of an equinox – is what causes them to be opposite. Image via EarthSky.

The equinoctial effect

There is another factor that comes into place that also increases aurora activity during equinoxes. It’s called the equinoctial effect. Equinoctial just means happening at or near the time of an equinox.

Many of the competing models to that of Russell and McPherron are based on the equinoctial effect. It’s not as strong as the effect mentioned above, but it does add to the equinox-aurora connection.

Here’s how it works. During equinoxes, Earth’s magnetic poles (north and south) are at right angles to the flowing solar wind two times a day. During these times, the solar wind is effectively stronger, enhancing magnetic storms. As the seasons change, the poles either point more toward or away from the sun, reducing this effect.

See what we mean? Magnetism … and the geometry of objects in space.

Sun in center with 4 Earths around it showing a different tilt at equinoxes and solstices.
The equinox is an event that takes place in Earth’s orbit around the sun. Image via NOAA/ National Weather Service.

Will you see colors in aurora? Or do you need a camera?

Magnetism and geometry in aurora season

So there is a reason why auroras are more frequent around the equinoxes. Researchers have been studying the phenomenon for over 100 years and still are studying it. They might not agree on all the details, but they do agree that the cause relates to the magnetic fields of both the sun and the Earth, working in conjunction with the sun-Earth geometry at a given time of year, as Earth moves in its orbit.

As meteorologist Curtis Grevenitz wrote this in his WeatherWise article for KTVH-News in Helena, Montana:

It is not just a coincidence that these two beautiful phenomena have a relationship.

Aurora photos from the EarthSky community

Over a wide expanse of water at night, vivid green in the sky gives way to streaks of crimson.
View at EarthSky Community Photos. | David Cox captured this beautiful view of auroras over Deep River, Ontario, on September 14, 2025, after an unexpected G3 (strong) geomagnetic storm. Thank you, David!
Green and pinkish lights over a small town at night.
View at EarthSky Community Photos. | EarthSky’s Marcy Curran in Cheyenne, Wyoming, took this photo on September 14, 2025, and wrote: “We’ve got an allsky camera at our house and I noticed green on the northern horizon. I knew it had to be an aurora, so I headed outside and could see a glow to the north. My cell phone picked up more detail and color.” Stunning! Thank you, Marcy!
Green rows of aurora like layered drapes over a dark lake.
View at EarthSky Community Photos. | Thea Schenk in Eidsfjord, Norway, captured this aurora in the form of curtains or drapes on October 1, 2025. Thank you, Thea!

More aurora photos

Green curtains of light cover all the sky.
View at EarthSky Community Photos. | Earll Johnson captured this beautiful auroral display on October 19, 2025 from a plane over Davis Strait in Greenland and wrote: “I used the native smart phone camera. I pulled down the shade to minimize reflections.” Beautiful photo Earll! Many thanks!
Mostly green lights, and some pink lights, in a starry sky.
View at EarthSky Community Photos. | Steven Karsh in Kananaskis, Alberta, sent us this photo of the auroras on October 1, 2025. Many thanks, Steve!

What are these weird aurora blobs? Explainer here

To our readers and community

We invite all of our readers to send us your recent photos. We love to see them! View our community photo page, or submit your image here.

Bottom line: There’s an aurora season around the March and September equinoxes each year, due to the way the magnetic fields of the sun and the Earth work in conjunction with sun-Earth geometry.

Check our daily sun news

Read more:

Amazing aurora photos capture the ‘sky on fire’

Auroras everywhere!

Auroras on May 10-11, 2024, wowed millions! Pics here

The post Yes, there’s an aurora season, and it’s here first appeared on EarthSky.



from EarthSky https://ift.tt/c3gWjYK
Bright pink and green auroras in the background, and a small church in the foreground.
View at EarthSky Community Photos. | JD Smith in Clay County, Minnesota, caught this beautiful image on November 12, 2025. Thank you, JD! Auroras are more frequent around the equinoxes. But why? Read about the aurora season below.

Science news, night sky events and beautiful photos, all in one place. Click here to subscribe to our free daily newsletter.

When is aurora season?

Yes, there is an aurora season, which comes around the fall and spring equinox each year. This pattern in nature – auroras increasing twice a year – has been known to scientists for more than a century.

We know that storms and eruptions on the sun cause disturbances in Earth’s magnetic field called geomagnetic storms. And we know the sun itself has cycles, including the famous 11-year solar cycle. That cycle appears to have peaked in late 2024, and the sun is still relatively active.

But an 11-year cycle is not a twice-yearly cycle. Why would geomagnetic storms increase twice a year?

As it turns out, it’s all about magnetism, geometry and something called the Russell-McPherron effect.

Read more: Forms of aurora: Arcs, curtains, coronas and more

Aurora season: Early studies

And it’s something nature-watchers have studied for a long time. Aloysius Cortie, an English Jesuit astronomer who conducted sun studies around the turn of the last century, published the first notable journal paper on the link between equinoxes and auroras in the year 1912.

Then, in 1940, the mathematician Sydney Chapman and his German colleague Julius Bartels included another discussion of the twice-yearly aurora season in their classic book Geomagnetism. This book became the standard textbook on Earth’s magnetism for several decades.

Later, a solar physicist – David Hathaway of NASA’s Marshall Space Flight Center in Huntsville, Alabama – created an updated plot showing the same seasonal pattern. Hathaway’s plot is below:

Graph with 12 bars with 2 peaks at months 3-4 and 9-10.
David Hathaway of NASA created an updated plot showing a seasonal variation in Earth’s magnetic storms, similar to the one that had been published in 1940. This one shows geomagnetic activity from 1932 to 2002. It shows a twice-a-year increase in the geomagnetic storms that cause auroras. Image via David Hathaway. Used with permission.

The Russell-McPherron effect

Over the years, scientist put forth several models to explain the twice-a-year variation in geomagnetic storms. An enduring explanation comes from Christopher Russell and Robert McPherron, both of UCLA. Their 1973 paper on the subject was titled Semiannual variation of geomagnetic activity.

Although their model explaining the seasonal variation in aurora frequency didn’t explain everything perfectly, it did show a physical connection between the geometry of Earth’s magnetic field and the magnetic field carried to Earth from the sun by the solar wind. And that is why, since the 1973 paper, the term Russell-McPherron effect has been used for seasonal auroras.

Streaks of aurora stretching upward, covering the sky, greenish at bottom with shades of red and pink above.
View at EarthSky Community Photos. | Robynanne Cash-Howard captured these auroras in Highbridge, Wisconsin, on November 12, 2025. Thank you, Robynanne!

So what’s the connection?

The Bz component. You know how a magnet always comes with two poles: a north pole and a south pole? Solar magnetic fields – carried to Earth via the solar wind – also have a north and south pole. Russell and McPherron showed that the “north-south” component of the sun’s magnetic field – called the Bz component by solar physicists – goes up and down over the year, in a way corresponding to the wobbling of Earth’s axis. They showed these fluctuations are largest during the equinoxes. Geomagnetic storms – and therefore auroras – happen most often when the “north-south” component of the solar wind is more or less opposite the “north-south” component of Earth’s own magnetic field.

It happens because – just as when two bar magnets oriented oppositely attract one another – so opposite Bz components attract. They open up a hole in Earth’s magnetic field, which allows the solar wind to flow more easily toward Earth’s magnetic poles.

When this happens, presto, we have auroras!

Check here for EarthSky’s daily sun news.

Sun and Earth with magnetic field between them and labeled arrows sticking out of Earth.
Sun on the left, Earth on the right. Not to scale. The sun’s magnetic field – carried by the solar wind – is between them. Note that the Bx and By components are oriented parallel to the ecliptic (Earth-sun plane). The 3rd component, called the Bz component, is perpendicular to the ecliptic. Geomagnetic storms – and therefore auroras – happen most often when the Bz component of the solar wind is more or less opposite the Bz component of Earth’s own magnetic field. The tilt of the Earth in relationship to the Earth-sun plane – around the time of an equinox – is what causes them to be opposite. Image via EarthSky.

The equinoctial effect

There is another factor that comes into place that also increases aurora activity during equinoxes. It’s called the equinoctial effect. Equinoctial just means happening at or near the time of an equinox.

Many of the competing models to that of Russell and McPherron are based on the equinoctial effect. It’s not as strong as the effect mentioned above, but it does add to the equinox-aurora connection.

Here’s how it works. During equinoxes, Earth’s magnetic poles (north and south) are at right angles to the flowing solar wind two times a day. During these times, the solar wind is effectively stronger, enhancing magnetic storms. As the seasons change, the poles either point more toward or away from the sun, reducing this effect.

See what we mean? Magnetism … and the geometry of objects in space.

Sun in center with 4 Earths around it showing a different tilt at equinoxes and solstices.
The equinox is an event that takes place in Earth’s orbit around the sun. Image via NOAA/ National Weather Service.

Will you see colors in aurora? Or do you need a camera?

Magnetism and geometry in aurora season

So there is a reason why auroras are more frequent around the equinoxes. Researchers have been studying the phenomenon for over 100 years and still are studying it. They might not agree on all the details, but they do agree that the cause relates to the magnetic fields of both the sun and the Earth, working in conjunction with the sun-Earth geometry at a given time of year, as Earth moves in its orbit.

As meteorologist Curtis Grevenitz wrote this in his WeatherWise article for KTVH-News in Helena, Montana:

It is not just a coincidence that these two beautiful phenomena have a relationship.

Aurora photos from the EarthSky community

Over a wide expanse of water at night, vivid green in the sky gives way to streaks of crimson.
View at EarthSky Community Photos. | David Cox captured this beautiful view of auroras over Deep River, Ontario, on September 14, 2025, after an unexpected G3 (strong) geomagnetic storm. Thank you, David!
Green and pinkish lights over a small town at night.
View at EarthSky Community Photos. | EarthSky’s Marcy Curran in Cheyenne, Wyoming, took this photo on September 14, 2025, and wrote: “We’ve got an allsky camera at our house and I noticed green on the northern horizon. I knew it had to be an aurora, so I headed outside and could see a glow to the north. My cell phone picked up more detail and color.” Stunning! Thank you, Marcy!
Green rows of aurora like layered drapes over a dark lake.
View at EarthSky Community Photos. | Thea Schenk in Eidsfjord, Norway, captured this aurora in the form of curtains or drapes on October 1, 2025. Thank you, Thea!

More aurora photos

Green curtains of light cover all the sky.
View at EarthSky Community Photos. | Earll Johnson captured this beautiful auroral display on October 19, 2025 from a plane over Davis Strait in Greenland and wrote: “I used the native smart phone camera. I pulled down the shade to minimize reflections.” Beautiful photo Earll! Many thanks!
Mostly green lights, and some pink lights, in a starry sky.
View at EarthSky Community Photos. | Steven Karsh in Kananaskis, Alberta, sent us this photo of the auroras on October 1, 2025. Many thanks, Steve!

What are these weird aurora blobs? Explainer here

To our readers and community

We invite all of our readers to send us your recent photos. We love to see them! View our community photo page, or submit your image here.

Bottom line: There’s an aurora season around the March and September equinoxes each year, due to the way the magnetic fields of the sun and the Earth work in conjunction with sun-Earth geometry.

Check our daily sun news

Read more:

Amazing aurora photos capture the ‘sky on fire’

Auroras everywhere!

Auroras on May 10-11, 2024, wowed millions! Pics here

The post Yes, there’s an aurora season, and it’s here first appeared on EarthSky.



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