Posted on Sep 24, 2019
APOD: 2019 September 24 - Sand Dunes Thawing on Mars
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Good morning, Rallypoint. Today's Astronomy Picture of the Day (APOD) is titled "Sand Dunes Thawing on Mars." Currently in orbit 400 km above Mars, the European Space Agency (ESA) and RosCosmos' ExoMars Trace Gas Orbiter captured this image in May 2019. As spring arrived in the Martian Northern Hemisphere, sand dunes near the pole begin to thaw. The carbon dioxide and water ice actually sublime in the thin atmosphere directly to gas. Thinner regions of ice typically defrost first revealing dark, gray sand that soaks in sunlight and accelerates the thaw. The process might even involve jets exploding through the thinning ice. By summer, the gray spots will expand to encompass the entire dunes.
APOD: 2019 September 24 - Sand Dunes Thawing on Mars
Posted from apod.nasa.gov
NASA
Space
Science
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Astronomy
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Martian Geology: Frozen Sand Dunes and Dry Ice Geysers | NASA JPL Mars Space Science HD Video
Visit my website at http://www.junglejoel.com - the Martian poles get so cold during the wintertime that carbon dioxide freezes out of the atmosphere - falli...
Thank you for this APOD and good morning Maj William W. 'Bill' Price! I was able to find a NASA video which complements your APOD and provides articulate information about the thawing of the Sand Dunes in the northern polar region of Mars... I believe your followers will enjoy and be enlightened by this video... https://youtu.be/Dyq3EsncmY0
Maj William W. 'Bill' Price Maj Marty Hogan COL Mikel J. Burroughs Lt Col Charlie Brown SSG Byron Howard Sr LTC Stephen F. Col Carl Whicker Maj Robert Thornton CWO3 Dennis M. LTC Wayne Brandon Sgt Deborah Cornatzer PO3 Bob McCord CW5 Jack Cardwell TSgt Joe C. SFC Stephen Lucas SMSgt Lawrence McCarter Lt Col John (Jack) Christensen MSgt Robert "Rock" Aldi SrA Marianne Santangelo Sgt Albert Castro
Maj William W. 'Bill' Price Maj Marty Hogan COL Mikel J. Burroughs Lt Col Charlie Brown SSG Byron Howard Sr LTC Stephen F. Col Carl Whicker Maj Robert Thornton CWO3 Dennis M. LTC Wayne Brandon Sgt Deborah Cornatzer PO3 Bob McCord CW5 Jack Cardwell TSgt Joe C. SFC Stephen Lucas SMSgt Lawrence McCarter Lt Col John (Jack) Christensen MSgt Robert "Rock" Aldi SrA Marianne Santangelo Sgt Albert Castro
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SPC Nancy Greene
Great Share SGT Harkins! This discovery could be extremely useful in further space exploration!
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THE OUTER LIMITS 60S V2 2A - THE INVISIBLE ENEMY (PROMETHEUS EDITION)
Opening scene from the classic tv series The Outer Limits episode The Invisible Enemy recut and remastered with scenes from the movie Prometheus. Just a test.
Thank you, my friend Maj William W. 'Bill' Price for posting the NASA Astronomy Picture of the Day (APOD) for Tuesday, September 24, 2019 entitled "Sand Dunes Thawing on Mars."
Wonderful picture what appears to be waves of sand dunes
Image: Sand Dunes Thawing on Mars - Image Credit & License - ESA, Roscosmos, CaSSIS
"Explanation: What are these strange shapes on Mars? Defrosting sand dunes. As spring dawned on the Northern Hemisphere of Mars, dunes of sand near the pole, as pictured here in late May by ESA's ExoMars Trace Gas Orbiter, began to thaw. The carbon dioxide and water ice actually sublime in the thin atmosphere directly to gas. Thinner regions of ice typically defrost first revealing sand whose darkness soaks in sunlight and accelerates the thaw. The process might even involve sandy jets exploding through the thinning ice. By summer, spots will expand to encompass the entire dunes. The Martian North Pole is ringed by many similar fields of barchan sand dunes, whose strange, smooth arcs are shaped by persistent Martian winds. "
THE OUTER LIMITS 60S V2 2A - THE INVISIBLE ENEMY (PROMETHEUS EDITION)
https://www.youtube.com/watch?v=fIWCY3CvBio
FYI SGT Mark Anderson SGT Jim Arnold SSgt Terry P. Maj Robert Thornton SFC (Join to see) SGT Steve McFarland MSG Andrew White Maj Bill Smith, Ph.D. MSG (Join to see)Cpl James R. " Jim" Gossett Jr SPC Jon O.SP5 Jeannie CarleSPC Chris Bayner-CwikPO1 Jerome NewlandTSgt David L.PO1 Robert GeorgeSGT John MelvinISG John FairclothSN Donald Hoffman
Wonderful picture what appears to be waves of sand dunes
Image: Sand Dunes Thawing on Mars - Image Credit & License - ESA, Roscosmos, CaSSIS
"Explanation: What are these strange shapes on Mars? Defrosting sand dunes. As spring dawned on the Northern Hemisphere of Mars, dunes of sand near the pole, as pictured here in late May by ESA's ExoMars Trace Gas Orbiter, began to thaw. The carbon dioxide and water ice actually sublime in the thin atmosphere directly to gas. Thinner regions of ice typically defrost first revealing sand whose darkness soaks in sunlight and accelerates the thaw. The process might even involve sandy jets exploding through the thinning ice. By summer, spots will expand to encompass the entire dunes. The Martian North Pole is ringed by many similar fields of barchan sand dunes, whose strange, smooth arcs are shaped by persistent Martian winds. "
THE OUTER LIMITS 60S V2 2A - THE INVISIBLE ENEMY (PROMETHEUS EDITION)
https://www.youtube.com/watch?v=fIWCY3CvBio
FYI SGT Mark Anderson SGT Jim Arnold SSgt Terry P. Maj Robert Thornton SFC (Join to see) SGT Steve McFarland MSG Andrew White Maj Bill Smith, Ph.D. MSG (Join to see)Cpl James R. " Jim" Gossett Jr SPC Jon O.SP5 Jeannie CarleSPC Chris Bayner-CwikPO1 Jerome NewlandTSgt David L.PO1 Robert GeorgeSGT John MelvinISG John FairclothSN Donald Hoffman
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