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If an asteroid were on a collision course with Earth, could we avoid disaster by pushing the asteroid off course? That's the question NASA attempted to answer by crashing an unmanned craft into a real asteroid. Plus, learn the English phrasal verb ""set off.""

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Asteroid crash: a test run to save humanity | Learn English phrasal verb 'set off' 19:13 Share

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Asteroid crash: a test run to save humanity | Learn English phrasal verb 'set off'