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Wild & dark lacy dunes on twisty bright layers

1 May 2018, 01:45 UTC
Wild & dark lacy dunes on twisty bright layers NASA/JPL/Univ. of Arizona

Some windblown dunes on Mars are just beyond words. These are a peculiar type of bedform called a transverse aeolian ridge, or TAR for short. Nobody really understands these things: are they dunes or ripples or something totally different? They’re common on Mars but unusual (maybe even nonexistent) on Earth. They’re also pretty dark-toned here, whereas on most of Mars they tend to be lighter than the surrounding rocks.

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