It looks like Jupiter kicked the asteroid down to Earth
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The chunk of space rock that killed the non-avian dinosaurs may have been a piece of comet that Jupiter’s gravity kicked onto a collision course with Earth. A new study suggests that the dinosaur-killing object was not an asteroid from between Jupiter and Mars, as is often hypothesised. Instead, the study authors argue, the impactor was a piece of comet from the Oort Cloud, a mass of icy bodies that surrounds the outer edges of the Solar System.