High Odds of Deep Impact[zz]# Astronomy - 天文
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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
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