What's painting dark streaks on Mars?

What's painting Mars? Every spring, dark streaks appear on its polar dunes, which may be caused by liquid water near the surface - a fillip for the hunt for life.
The dark streaks of sand a few metres wide slide downslope at about a metre a day. "They show a branching pattern, so it seems like some liquid material is flowing," says Akos Kereszturi at the Collegium Budapest in Hungary.

Full article on NewScientist



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