The first sample of powdered rock extracted by the drill of Curiosity is seen on Feb. 20, 2013. Powder drilled out of a rock on Mars contains the best evidence yet that the Red Planet could have supported living microbes billions of years ago, the team be
Credit: NASA/JPL/Caltech/MSSS via EPA
For the Curiosity rover, it's just another day on Mars—but back on Earth, Tuesday was a day to look back at the $2.5 billion mission's first year, including a moment when it looked as if the mission might be lost.
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