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Sand dunes often accumulate in the floors of craters. In this region of Lyot Crater, NASA's Mars Reconnaissance Orbiter (MRO) shows a field of classic barchan dunes on Jan. 24, 2018. Just to the south of the group of barchan dunes is one large dune with a more complex structure. This particular dune, appearing like turquoise blue in enhanced color, is made of finer material and/or has a different composition than the surrounding. The map is projected above at a scale of 25 centimeters (9.8 inches) per pixel. [The original image scale is 34.7 centimeters (13.7 inches) per pixel (with 1 x 1 binning); objects on the order of 104 centimeters (40.9 inches) across are resolved.] North is up.
This particular dune, appearing like turquoise blue in enhanced color, is made of finer material and/or has a different composition than the surrounding.
They just made it look blue by enhancing the colors so that it could be seen easier. Cool pic though!
originally posted by: odzeandennz
a reply to: Alien Abduct
too many 'artistic freedoms' with images communicated with the public from NASA
originally posted by: wildespace
The official HiRISE site provides approximately true-colour versions of the images too. www.uahirise.org...
Here's an (approximately) true-colour image of that dune: hirise-pds.lpl.arizona.edu...
It still looks kinda blue, which may point to basaltic material.
originally posted by: CreationBro
All of the -mons like Olympus Mons...aka de-mons