WASHINGTON — NASA is aiming to launch a rocket to an asteroid in five years and grab a boulder off of it — a stepping stone and training mission for an eventual trip sending humans to Mars.
The space agency Wednesday unveiled details of the $1.25 billion plan to launch a solar-powered unmanned spaceship to an asteroid in December 2020. The ship would spend about a year circling the large space rock and pluck a 13-foot boulder off its surface using robotic arms. It would have three to five opportunities to grab the rock, said Robert Lightfoot, NASA's associate administrator.
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