Asteroid Redirect Mission Ends Development

The Asteroid Redirect Mission was intended to develop a robotic spacecraft to visit a large near-Earth asteroid, collect a multi-ton boulder from its surface and redirect the boulder into orbit around the moon, where astronauts would have explored it and returned to Earth with samples. White House Space Policy Directive 1, issued Dec. 11, 2017, ended the mission. but many of the central technologies in development for that mission, such as solar electric propulsion, will continue, as they constitute vital capabilities needed for future human deep space missions.