March 2, 2001

A Smack From Space Linked to Earth's Worst Extinctions

By RICHARD MONASTERSKY

Geological sleuths now think they have nabbed the culprit in the

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A Plucky Spacecraft Explores a Distant Asteroid

planet's greatest murder mystery. New evidence implicates a comet or asteroid in the extinctions that wiped out the vast majority of species living 250 million years ago -- a cataclysm so great it

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