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Sgt Commander, Dav Chapter #90
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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 Capt 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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SGT David A. 'Cowboy' Groth
SGT David A. 'Cowboy' Groth
1 y
Excellent video share brother Kerry.
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Sgt John Houck
Sgt John Houck
1 y
Thank you for the share Kerry!
(5)
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SPC Nancy Greene
SPC Nancy Greene
1 y
Great Share SGT Harkins! This discovery could be extremely useful in further space exploration!
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Lt Col John (Jack) Christensen
Lt Col John (Jack) Christensen
1 y
Thanks for the video Kerry.
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LTC Stephen F.
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Edited 1 y ago
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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. "

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CW5 Jack Cardwell
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Very strange looking!
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Sgt Commander, Dav Chapter #90
Sgt (Join to see)
1 y
It is out of this world CW5 Jack Cardwell!!! LOL!
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