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Core samples offer clues about ancient asteroid crash

Scientists are piecing together what happened when a massive asteroid crashed into the Earth about 66 million years ago by studying core samples drilled from the rock beneath the Chicxulub crater, the site of the impact. "It's an expanded record of events that we were able to recover from within ground zero," said Sean Gulick, author of the study published in Proceedings of the National Academy of Sciences.

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