DART spacecraft due to hit asteroid in major test

NASA is about to make many a Hollywood sci-fi plot a stunning reality, when it slams a spacecraft into an asteroid. And this time it's not just for the views– this is a mission to find out whether the American space agency could actually one day avert a doomsday collision by shifting the path of an asteroid away from Earth. Liz Maddock has the details. Subscribe: http://trt.world/subscribe
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