"Mike Dworetsky" :

The existence of asteroid belts, Kuiper Belts and Oort clouds is not
inevitable in all systems, though probably likely. The craters on Callisto
are mostly very ancient, so maybe a biosphere can exist after a few billion
years. Every once in a while there may be an "evolution's helper" event.

On the otherhand having ringside seats to watch a ShoeMaker event would do
wonder to get people to keep a eye on the skies.

Earl Colby Pottinger

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