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The Need For Paleo-Endust

*** Asteroid dust may have helped kill dinosaurs - report

Space dust from broken-up asteroids may have started the dinosaurs
down the road to gradual extinction, astronomers said Thursday. The
final blow probably came when larger pieces of the asteroids actually
collided with the Earth, the researchers at the University of Florida
and the Carnegie Institution of Washington said. The good news,
according to the report in the journal Science, is that Earth would
have about a million years warning before another such asteroid
impact. Currently, about 30,000 metric tons of dust from asteroids
falls to the Earth every year, but in the past the rate has been as
much as 10 million tons a year, researchers said. See