In this still from a NASA video, a robotic spacecraft's capture bag swallows an asteroid in order to return it to Earth. NASA plans to retrieve an asteroid and park it near the moon by 2025, possibly ... more 
In this still from a NASA video, a robotic spacecraft's capture bag swallows an asteroid in order to return it to Earth. NASA plans to retrieve an asteroid and park it near the moon by 2025, possibly even by 2021, so astronauts can explore it. less 
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SPACE.com | Photo By NASA
Fri, Apr 26, 2013 10:24 AM EDT