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Nasa test to deflect an asteroid
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.
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