Question:
What is the chance of the earth getting hit by a meteor that would wipeout its population?
Replies:
About one in a hundred million for any given year-- that's just a
number I've heard; it's probably accurate to within a factor of 10.
This would be an impact that could exterminate all higher forms of
life. Now, the odds for an impact that threatens human civilization
is less, about one in a million.
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