How big is 45P/Honda-Mrkos-Pajdusakova comet? Can it go through
Earth's atmosphere and hit Earth?
As a more-or-less typical comet, Comet Honda-Mrkos-Pajdusakova has a nucleus
about ten kilometers across. It is not on such a course, but if it were to
hit Earth someday, it would result in a K/T event with enormous damage to our
planet and mass-extinctions.
David H. Levy
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Update: June 2012