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Space craft to smash into an asteroid, aiming to alter trajectory
A rocket has lifted off from California on a mission to deliberately crash a spacecraft into an asteroid. The mission of the DART- Double Asteroid Redirection Test - is to determine if it's possible to divert asteroids that are on a collision course with Earth. Right now, no cosmic debris is threatening our existence. But as Sarah Morice reports, NASA is preparing for the future.
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