Scientists Detect Giant ‘Megaripple’ Structures Moving Across Mars – ScienceAlert

For the first time, scientists have observed that ‘megaripples’ on Mars huge sand waves seen on the Martian surface are moving structures, and not ancient relics stuck in place since the Red Planet’s distant past.
Megaripples, which also occur in deserts on Earth, are generally larger than smaller sand ripples, and are composed of chunkier, coarser sand grains that sit at the top of their crests, resting on finer grains buried at the bottom.
The heftiness of the crest grains combined with the …

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