Researchers Suspect Impact Crater Near Australia

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Many scientists believe the mass extinction of the world's dinosaurs may have been caused by a huge extraterrestrial impact. Now researchers say a similar event may have caused another, even larger, mass die-off 250 million years ago. Scientists report in Science this week that the impact crater from that catastrophe may lie buried off the northwest coast of Australia — a proposal that has met with skepticism from other researchers. NPR's Richard Harris reports.

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