Nasa robot ship will pluck a large boulder off an asteroid . Will be visited by astronauts aboard the Orion spacecraft . Astronauts would study the asteroid and collect samples . Will test new technologies needed for an eventual mission to Earth .
Nasa robot ship will pluck a large boulder off an asteroid . Will be visited by astronauts aboard the Orion spacecraft . Astronauts would study the asteroid and collect samples . Will test new technologies needed for an eventual mission to Mars .