Meteorites quickly reach Earth

By Sid Perkins, 15:51 PM April 15, 2008

Fragments from collisions between large bodies in the asteroid belt, which lies between the orbits of Mars and Jupiter, can reach Earth in as little as 100,000 years, chemical analyses of such material suggest.

Excavations at a quarry in southern Sweden have yielded more than 50 meteorites. Those stones fell into a shallow sea about 480 million years ago, when the carbonate-rich sediments that eventually became limestone were accumulating, says Rainer Wieler, an astrochemist at the Swiss Fede...

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