How this spacecraft will sample the rocks of an asteroid without even landing there



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More than two years after its launch, a spacecraft called OSIRIS-REx is approaching its target, an asteroid named Bennu. Scientists hope that Bennu's rock samples will provide information on the probability of life on other planets, as well as on the risk that the asteroid poses for the Earth. The scientific correspondent, Miles O. Brien, explains the tricky method of "touching the mouse" to sample the surface of the asteroid.

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