Somewhere around 700,000 years ago, an asteroid or comet slammed into Mars and sent debris flying everywhere. And perhaps 1,000 years ago, one small piece of rock finally ended up on Earth. Now that same bit of basalt is going back to Mars, reports the BBC. As the Guardian explains, NASA is ferrying the tiny meteorite back to the red planet as part of a new mission that blasts off Thursday. The
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Mars: A rock returns home
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