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Martian valleys could have been carved by surprisingly little water

5 November 2015 Astronomy Now

Vast valley networks on Mars have suggested that water may have flowed there for millions of years. Now a study at Brown University suggests the valleys could have been carved by much less water in as little as a few hundred to 10,000 years. The findings are consistent with the idea that early Mars may have been cold and icy, with surface water flowing sporadically in response to short-term climate changes.

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Curiosity rover eyes prominent mineral veins on Mars

2 April 2015 Astronomy Now

Two-tone mineral veins at a site NASA’s Curiosity rover has reached by climbing a layered Martian mountain offer clues about multiple episodes of fluid movement. These episodes occurred later than the wet environmental conditions that formed lake-bed deposits the rover examined at the mountain’s base.

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Mars lost an ocean’s worth of water

6 March 2015 Astronomy Now

NASA scientists have determined that a primitive ocean occupying almost half of Mars’ northern hemisphere once held more water than Earth’s Arctic Ocean and that the Red Planet has lost 87% of that water to space.