NASA Science News for February 23, 2001
They say lightning never strikes twice. Well, how about asteroids? A violent collision with a space rock, like the one that doomed the dinosaurs, may have also caused our planet's greatest mass extinction 250 million years ago.
FULL STORY and GRAPHICS at:
http://science.nasa.gov/headlines/y2001/ast23feb_1.htm?list154233###
Contact: Tony Phillips[email protected]
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