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What causes the black dots on dunes on Mars? As spring dawned on the Northern Hemisphere of Mars in 2004, dunes of sand near the poles begin to defrost. Thinner regions of ice typically thaw first revealing sand whose darkness soaks in sunlight and accelerates the thaw. The process might involve sandy jets exploding through the thinning ice. By summer, the spots expanded to encompass the entire dunes that were then completely thawed and dark.
Originally posted by sensfan
I'm afraid that the "trees" on mars have in fact been debunked on many threads here on ats and elsewhere. With more high res images of the locations, they are clearly not trees.
Originally posted by GreenRobot
I mean, they're guessing like everyone else.