Asteriod Hitting Earth
Name: Scott W.
Date: 1999 - 2000
Could an un-noticed asteroid of any size really
strike Earthat any time? At what distance and of what mass would a body
be unfailingly spotted every time?
Yes, relatively few people are watching asteroids with the intention of
warning us when one threatens. After a body larger than a basketball
has entered the atmosphere, everyone would notice.
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Update: June 2012