Yesterday the MESSENGER spacecraft circled behind Mercury one last time, where no one on Earth could see it, and slammed into the surface of the intemperate planet at an estimated 8750 miles per hour. It is the second probe to have visited Mercury—Mariner 10 completed three fly-bys of the planet in 1974, and according to NASA, is still orbiting the sun; probably fried, out of fuel, a derelict.
Mosaic Image of Mercury as photographed by Mariner 10. Image credit: NASA/JPL.
MESSENGER began its scientific mission in 2011. With its destination so near to the sun, under the influence of immense gravitational force, MESSENGER had to fly by “Earth once, Venus twice, and Mercury itself three times” in order to slow down and finally achieve orbit. The spacecraft proceeded to take over 100,000 images of Mercury’s surface, allowing NASA to map 100% of the innermost planet. After completing its primary objectives in 2012, Messenger’s mission was twice extended. According to Wikipedia, “MESSENGER‘s instruments have yielded significant data, including a characterization of Mercury’s magnetic field and the discovery of water ice at the planet’s north pole.” Using an array of spectrometers and a laser altimeter, MESSENGER also revealed a ton about the geology and composition of the planet, including evidence of past volcanism and a liquid iron core.
Topography of Mercury’s northern hemisphere as measured by MESSENGER’s laser altimeter. Image credit: NASA/JPL.
MESSENGER continued its surveys until its dying breath. After running out of liquid propellant, its operations were extended four weeks with the innovative appropriation of gaseous helium as a fuel source. Finally, when there was no way left to steer itself, MESSENGER made its very own, brand new crater on the planet to which its life was dedicated.
from ScienceBlogs http://ift.tt/1KAsSVw
Yesterday the MESSENGER spacecraft circled behind Mercury one last time, where no one on Earth could see it, and slammed into the surface of the intemperate planet at an estimated 8750 miles per hour. It is the second probe to have visited Mercury—Mariner 10 completed three fly-bys of the planet in 1974, and according to NASA, is still orbiting the sun; probably fried, out of fuel, a derelict.
Mosaic Image of Mercury as photographed by Mariner 10. Image credit: NASA/JPL.
MESSENGER began its scientific mission in 2011. With its destination so near to the sun, under the influence of immense gravitational force, MESSENGER had to fly by “Earth once, Venus twice, and Mercury itself three times” in order to slow down and finally achieve orbit. The spacecraft proceeded to take over 100,000 images of Mercury’s surface, allowing NASA to map 100% of the innermost planet. After completing its primary objectives in 2012, Messenger’s mission was twice extended. According to Wikipedia, “MESSENGER‘s instruments have yielded significant data, including a characterization of Mercury’s magnetic field and the discovery of water ice at the planet’s north pole.” Using an array of spectrometers and a laser altimeter, MESSENGER also revealed a ton about the geology and composition of the planet, including evidence of past volcanism and a liquid iron core.
Topography of Mercury’s northern hemisphere as measured by MESSENGER’s laser altimeter. Image credit: NASA/JPL.
MESSENGER continued its surveys until its dying breath. After running out of liquid propellant, its operations were extended four weeks with the innovative appropriation of gaseous helium as a fuel source. Finally, when there was no way left to steer itself, MESSENGER made its very own, brand new crater on the planet to which its life was dedicated.
from ScienceBlogs http://ift.tt/1KAsSVw
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