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Cosmic Diary

Wavy dunes and straight dunes

9 Oct 2017, 15:36 UTC
Wavy dunes and straight dunes NASA/JPL/Univ. of Arizona
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The dunes here are ~40 m (131 ft) apart and ~200 m (219 yd) long. (They’re not really dunes, but rather a windblown thing nearly unique to Mars that we call TARs.) Look carefully and you’ll see that some have very straight crests, like a sword – this is typical for TARs. But others have wavy crestlines, like huge serrated knives.

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