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Asteroids get a lot of attention.
It's no wonder - small ones continually pelt the Earth and a large one may have caused the extinction of the dinosaurs. But that's just part of their story. Get answers to your questions about asteroids directly from the scientists keeping tabs on them. This is just one of several hundred rocks, varying in size from a few metres to a few kilometres across, whose orbits around the sun cross the Earth's. A few dozen are potentially extremely hazardous, because they could one day do to humanity what one of their number did to the dinosaurs 65m years ago.