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Scientists reconstruct ancient impact that dwarfs dinosaur-extinction blast

representation of the size of the asteroid thought to have killed the dinosaurs

Picture this: A massive asteroid almost as wide as Rhode Island and about three to five times larger than the rock thought to have wiped out the dinosaurs slams into Earth. The collision punches a crater into the planet’s crust that’s nearly 500 kilometers (about 300 miles) across: greater than ...

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