Minor planets

Comet from edge of solar system killed the dinosaurs: Study

Sixty-six million years ago, a huge celestial object struck off the coast of what is now Mexico, triggering a catastrophic "impact winter" that eventually wiped out three-quarters of life on Earth, including the dinosaurs.

A pair of astronomers at Harvard say they have now resolved long-standing mysteries surrounding the nature and origin of the "Chicxulub impactor."

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