蜜芽传媒

Nasa鈥檚 Double Asteroid Redirection Test mission will target a near-Earth asteroid in 2022. Didymos and its target moonlet Didymoon are not on course for collision, but this is a test of technologies for preventing an impact of Earth by a hazardous asteroid. Dr Kelly Fast, Program Manager at the Planetary Defense Coordination Office, tells Marnie Chesterton more.