About how often does a large meteoroid or asteroid of the scale sufficient to produce a planet-wide catastrophe (100 megatons energy equivalent or more) strike the Earth on average?

0 votes
    approximately once per year
     approximately once every 10 million years or so
     approximately once every few thousand years
     approximately once every billion years
     There is no evidence of such an event ever having taken place.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

0 votes
approximately once every 10 million years or so
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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