Sand Dunes, Odd Rock Piles Spied by Mars Orbiter (Photo)

Space.com | 3/7/2018 | Google+
Night987 (Posted by) Level 3
Click For Photo: https://img.purch.com/h/1000/aHR0cDovL3d3dy5zcGFjZS5jb20vaW1hZ2VzL2kvMDAwLzA3NC84MDAvb3JpZ2luYWwvbXJvLW1hcnMtc2FuZC1kdW5lcy1ib3VsZGVycy5qcGc=?&imgtype=.jpg

Sinuous Martian sand dunes take center stage in a newly released photo by a NASA spacecraft — but don't dismiss the speckly ground surrounding them.

The photo, which was taken Jan. 27 by the High Resolution Imaging Science Experiment camera aboard NASA's Mars Reconnaissance Orbiter (MRO) shows parallel dark and light stripes arrayed from the upper left to the bottom right on the duneless ground.

Boulders - Intervals - Stripes - Signature - Phenomenon

If you look closely, you can see boulders piled at regular intervals within the dark stripes — the possible signature of a phenomenon called "frost heave," NASA officials said.

"With frost heave, [repeated] freezing and thawing of the ground can bring rocks to the surface and organize them into piles, stripes or even circles," NASA officials wrote in a description of the photo, which was released Tuesday (March 6). "On Earth, one of these temperature cycles takes a year, but on Mars it might be connected to changes in the...
(Excerpt) Read more at: Space.com
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