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Shifting dark streaks on the surface of Mars are signs that water is flowing there today, scientists said Thursday.
The possible presence of liquid water is certain to revive speculation that Mars is teeming with microbial organisms. The recipe for life, at least as we know it, calls for liquid water, carbon-based molecules and a source for energy.
There is plenty of ice on Mars, but the chemical reactions for life come to a halt when water freezes.