comet that wiped out the dinosaurs travelled 186 billion miles before being "pinballed" by Jupiter, research has found.Harvard scientists reckon the 10-mile wide space rock started off as debris from the Oort Cloud at the edge of the Solar System.Their new theory says it was pulled out of its orbit by Jupiter before the Sun ripped it apart and sent bits smashing into the Earth.Harvard's top astronomer Professor Avi Loeb and astrophysicist Amir Siraj said their predictions matches with the dates of other massive craters on Earths.Mr Siraj said: "Basically, Jupiter acts as a kind of pinball machine."Jupiter kicks these incoming long-period comets into orbits that bring them very close to the Sun."Mystery surrounds the origin of the.
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