NASA’s Plan to Give the Moon a Moon

IT SOUNDS ALMOST like a late ’90s sci-fi flick: NASA sends a spacecraft to an asteroid, plucks a boulder off its surface with a robotic claw, and brings it back in orbit around the moon. Then, brave astronaut heroes go and study the space rock up close—and bring samples back to Earth. Except it’s not a movie: That’s the real-life idea for the Asteroid Redirect Mission, which will let NASA test technology and practice techniques needed for going to Mars.

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