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February 3 2013

Dinosaur-killing asteroid was a double menace?


The space rock that slammed into Earth and wiped it clean of dinosaurs, around 65.5 million years ago, may have been a binary - two asteroids orbiting each other -according to a new study.

The dino-killing asteroid is usually thought of as a single rock with a diameter of 7 to 10 kilometres, but it may really have been two widely separated rocks with that combined diameter, researchers said.

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