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Mars had two wet eras, Curiosity rover tells us

At the European Planetary Science Congress, researchers summed up the flood of evidence that Mars was once a wet planet.

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At a recent conference in London, NASA scientists presented the overwhelming evidence for the Red Planet's two past water-blue periods.

AP/NASA

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Water, water everywhere, and some of it fit to drink.

That’s the picture of ancient Mars that has emerged during the past few months thanks to discoveries by NASA's Curiosity rover, which has been exploring the Red Planet since touching down inside Gale Crater in August 2012.

The announcements have come in dribs and drabs, but presented together recently here at the European Planetary Science Congress, they provide compelling evidence that Mars was quite wet in the distant past. [The Search for Water on Mars (Photos)]

During many sessions at the conference, which was held Sept. 8 to Sept. 13 in London, scientists presented details of the rover’s most exciting finds, made before it began the long drive toward the towering Mount Sharp this past July.

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And the words that could be heard most often were hydrogen, hydration, rocks and water. Especially water.

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