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A group of Dutch astrophysicists has stumbled across a set of giant “rings” on Venus. They’re not solid planetary rings (like Saturn’s), but planet-circling concentric banding, hidden high in the atmosphere of Venus. And they’re not visible to the eye, but can be seen in polarized light, which blocks some scattered light and enhances subtle patterns. They are waves/ ripples in Venus’ atmosphere, but very ring-like! The group discovered them while taking a 2nd look at images of Venus captured in 2010 by the William Herschel Telescope.
The rings appear to be the result of differences in gas density above the cloud tops. A simulation of Venus’ atmosphere created for the study shows gravity waves could be driving the phenomenon. The same kind of gravity waves create the broad, expanding rings that spread across a pond after you toss in a stone. And gravity waves help shape weather and climate patterns on Earth.
A paper detailing the discovery published on July 9, 2026 in the Planetary Science Journal of the American Astronomical Society.
Venus rings found high in its atmosphere
The announcement of rings in Venus’ atmosphere is recent, but the data was collected in 2010. The authors said they captured the images while waiting for the sky to darken enough to continue their hunt for exoplanets:
The Venus images we present here are truly serendipitous. They were captured [using] the 4.2-meter William Herschel Telescope … during a period of about 36 minutes in which we were waiting for the end of the astronomical evening twilight on May 24, 2010. [We were waiting] to start observations of circumstellar disks [around exoplanets].
The Extreme Polarimeter (ExPo) was an instrument designed to detect circumstellar disks of gas and debris around distant stars. Signs of exoplanets are often hidden within these disks. ExPo has since been decommissioned and disassembled.
The giant rings on Venus are centered on a region downwind of the planet’s subsolar point, the continuously moving spot on Venus’ surface from which the sun appears directly overhead (at the zenith). The subsolar point on Venus moves slowly, as the planet takes 117 Earth days to complete one rotation.
Images of Venus rings are one-of-a-kind
At first, because they’re almost centered on the brightest point on the planet’s disk, the researchers thought the giant rings on Venus might be an artifact of the ExPo detector. But the tool for measuring the polarization of light waves was designed to avoid such errors. Six different kinds of filters were used to create six sets of images, and the rings only showed up in three of them.
The science team had no other explanation: the rings are really there. And these are the only pictures of them ever taken.
The images from ExPo were captured under the extremely dark skies above the Canary Islands off the coast of Africa during a night of exceptionally clear skies. Unfortunately, the paper explains why that’s not the only reason other images of the rings can’t be taken with ExPo on the Magellan Telescope:
We have no other images of Venus with rings, as we did not have other opportunities to observe Venus under such advantageous seeing conditions and, due to the experimental nature of ExPo, the instrument has been taken apart and its optical components reused for other experiments. To the best of our knowledge, there are no other polarimeters available that combine imaging with ExPo’s high polarimetric sensitivity.
Upcoming mission to Venus to help explain ring mystery
The researchers, of course, want more observations to deepen our understanding of how and why these Venus rings form. They want both ground-based imagery, as well as measurements taken by space-based telescopes.
They might get an extremely close look from ESA’s EnVision mission. It includes plans to carry a high-resolution polarimeter into orbit around Venus. Launch is scheduled for 2032.
But who knows? The rings might not be there when the orbiter arrives. No one knows how often this atmospheric ring feature forms or how long it lasts.
And, despite not finding an error in the way ExPo collected the data, it’s still possible the rings are a false signal. While it looks like a newly discovered weather pattern, there isn’t enough information to be sure. The researchers said:
Moreover, ExPo was an experimental instrument that was not later reinstalled in an identical configuration and has since been dismantled. For these reasons, the present observations cannot by themselves establish a definitive detection of a new Venusian atmospheric phenomenon and should instead be viewed as a candidate signal that requires independent confirmation.
Still, what we see in the first ring images is enough to let the team speculate about how the rings came to be:
If the observed pattern is astrophysical rather than instrumental, one plausible explanation is spatial variation in the gas density above the hazes and clouds. Such planet-wide density variations could result from atmospheric waves emanating from the region close to the subsolar point. …
Bottom line: New analysis of images taken in 2010 reveal giant Venus rings. The rings are high in the Venus atmosphere. They are ripples in the atmosphere, not solid particles.
Read more: New evidence of lava tube on Venus found in old radar data
The post Venus rings found high above planet’s thick clouds first appeared on EarthSky.
from EarthSky https://ift.tt/x7BcR4g
Science matters. Wonder matters. You matter. Join our 2026 Donation Campaign today.
A group of Dutch astrophysicists has stumbled across a set of giant “rings” on Venus. They’re not solid planetary rings (like Saturn’s), but planet-circling concentric banding, hidden high in the atmosphere of Venus. And they’re not visible to the eye, but can be seen in polarized light, which blocks some scattered light and enhances subtle patterns. They are waves/ ripples in Venus’ atmosphere, but very ring-like! The group discovered them while taking a 2nd look at images of Venus captured in 2010 by the William Herschel Telescope.
The rings appear to be the result of differences in gas density above the cloud tops. A simulation of Venus’ atmosphere created for the study shows gravity waves could be driving the phenomenon. The same kind of gravity waves create the broad, expanding rings that spread across a pond after you toss in a stone. And gravity waves help shape weather and climate patterns on Earth.
A paper detailing the discovery published on July 9, 2026 in the Planetary Science Journal of the American Astronomical Society.
Venus rings found high in its atmosphere
The announcement of rings in Venus’ atmosphere is recent, but the data was collected in 2010. The authors said they captured the images while waiting for the sky to darken enough to continue their hunt for exoplanets:
The Venus images we present here are truly serendipitous. They were captured [using] the 4.2-meter William Herschel Telescope … during a period of about 36 minutes in which we were waiting for the end of the astronomical evening twilight on May 24, 2010. [We were waiting] to start observations of circumstellar disks [around exoplanets].
The Extreme Polarimeter (ExPo) was an instrument designed to detect circumstellar disks of gas and debris around distant stars. Signs of exoplanets are often hidden within these disks. ExPo has since been decommissioned and disassembled.
The giant rings on Venus are centered on a region downwind of the planet’s subsolar point, the continuously moving spot on Venus’ surface from which the sun appears directly overhead (at the zenith). The subsolar point on Venus moves slowly, as the planet takes 117 Earth days to complete one rotation.
Images of Venus rings are one-of-a-kind
At first, because they’re almost centered on the brightest point on the planet’s disk, the researchers thought the giant rings on Venus might be an artifact of the ExPo detector. But the tool for measuring the polarization of light waves was designed to avoid such errors. Six different kinds of filters were used to create six sets of images, and the rings only showed up in three of them.
The science team had no other explanation: the rings are really there. And these are the only pictures of them ever taken.
The images from ExPo were captured under the extremely dark skies above the Canary Islands off the coast of Africa during a night of exceptionally clear skies. Unfortunately, the paper explains why that’s not the only reason other images of the rings can’t be taken with ExPo on the Magellan Telescope:
We have no other images of Venus with rings, as we did not have other opportunities to observe Venus under such advantageous seeing conditions and, due to the experimental nature of ExPo, the instrument has been taken apart and its optical components reused for other experiments. To the best of our knowledge, there are no other polarimeters available that combine imaging with ExPo’s high polarimetric sensitivity.
Upcoming mission to Venus to help explain ring mystery
The researchers, of course, want more observations to deepen our understanding of how and why these Venus rings form. They want both ground-based imagery, as well as measurements taken by space-based telescopes.
They might get an extremely close look from ESA’s EnVision mission. It includes plans to carry a high-resolution polarimeter into orbit around Venus. Launch is scheduled for 2032.
But who knows? The rings might not be there when the orbiter arrives. No one knows how often this atmospheric ring feature forms or how long it lasts.
And, despite not finding an error in the way ExPo collected the data, it’s still possible the rings are a false signal. While it looks like a newly discovered weather pattern, there isn’t enough information to be sure. The researchers said:
Moreover, ExPo was an experimental instrument that was not later reinstalled in an identical configuration and has since been dismantled. For these reasons, the present observations cannot by themselves establish a definitive detection of a new Venusian atmospheric phenomenon and should instead be viewed as a candidate signal that requires independent confirmation.
Still, what we see in the first ring images is enough to let the team speculate about how the rings came to be:
If the observed pattern is astrophysical rather than instrumental, one plausible explanation is spatial variation in the gas density above the hazes and clouds. Such planet-wide density variations could result from atmospheric waves emanating from the region close to the subsolar point. …
Bottom line: New analysis of images taken in 2010 reveal giant Venus rings. The rings are high in the Venus atmosphere. They are ripples in the atmosphere, not solid particles.
Read more: New evidence of lava tube on Venus found in old radar data
The post Venus rings found high above planet’s thick clouds first appeared on EarthSky.
from EarthSky https://ift.tt/x7BcR4g
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