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发帖数: 298 | 1 A certain large asteroid could strike Earth — in about 800 years.
by David L. Chandler
Astronomers this week are reporting the highest probability ever calculated
for a collision between an asteroid and our planet. An asteroid called 1950
DA, according to a team writing in the April 5 issue of Science, is about 1
kilometer in diameter — big enough to cause widepread devastation — and its
1-in-300 odds of impacting Earth make it at least 100 times more threatening
than any known possible impactor |
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