Asteroid struck by Nasa probe leaves 10,000km trail

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A telescope in Chile captures an image of a comet-like plume of debris behind the giant rock. …

The technique could be used if there was an asteroid heading for Earth at some point in the future, he said, describing it as a “very simple idea” – ramming the spacecraft into the object you are worried about, and using the mass and speed of the craft “to slightly change the orbit of that object enough so that it would miss the Earth”.

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