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Recurring Martian Streaks: Flowing Sand, Not Water?

20 Nov 2017, 16:15 UTC
Recurring Martian Streaks: Flowing Sand, Not Water? NASA/JPL-Caltech/UA/USGS

Dark features on Mars previously considered evidence for subsurface flowing of water are interpreted by new research as granular flows, where grains of sand and dust slip downhill to make dark streaks, rather than the ground being darkened by seeping water.

Continuing examination of these still-perplexing seasonal dark streaks with a powerful camera on NASA's Mars Reconnaissance Orbiter (MRO) shows they exist only on slopes steep enough for dry grains to descend the way they do on faces of active dunes.

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