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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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The descent and landing were called "seven minutes of terror."

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Since that white-knuckle event, NASA's Curiosity rover has had a little longer than half-a-Martian-year of quiet wonder.

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But in Earth years, it's an anniversary:

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Curiosity touched down on Mars early on August 6th, Earth Eastern time, 2012,

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setting off a jubilant celebration at NASA's Jet Propulsion Laboratory.

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Since then, the plutonium-powered robot has logged more than one kilometer of driving on Mars.

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It has photographed what looks to be an ancient, gravely streambed.

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And it has drilled into sedimentary rocks and consumed the powdery extract to analyze its composition.

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Those rocks bear traces of an ancient wet environment where "conditions once were favorable for life," according to project scientist John Grotzinger.

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The rover has even gulped a bit of Martian air to measure its composition.

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As of yet, Curiosity has not detected any methane,

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its presence might point to ongoing biological activity on the Red Planet.

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But the evidence gathered indicates that Mars may well have been habitable at some point in its history.

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Stay tuned for Earth year 2, as Curiosity keeps rolling along.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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