Awatmath.1949
net.space
utzoo!decvax!watmath!bstempleton
Wed Mar 10 13:01:36 1982
Re: life is dangerous on planets!
Large impacts might wipe out races, but most impacts would be small, and
would only have the effect of potentially destroying civilizations.
Our civilization (world civilization that is) is quite young, and developed
in much less than the expected mean time between impacts anywhere.