Could a million small asteroids be on a collision course with Earth?

Up to a million asteroids could be on course for the Earth over the next century, according to a new study by Chinese astronomers.While the risk of collision is low and most of the asteroids are less than 100 metres across – small compared with the one that wiped out the dinosaurs – each one has more kinetic energy than an atomic bomb and we know little about them.The small size and large number made these short-term hazardous asteroids (SHA) extremely difficult to track, said Professor Gan…


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