From: Mike Lorrey (mlorrey@yahoo.com)
Date: Mon Dec 16 2002 - 12:23:52 MST
http://www.space.com/scienceastronomy/supernova_threat_021216.html
It seems that a supernova must be within about 25 light years of Earth
for its emissions to significantly impact our ozone levels to the point
of causing mass extinctions. Based on this, the risk of such occuring
is about once in a billion years.
This would seem to rule out the GRB mechanism for the Fermi paradox,
though the current large volume of space free of dust around our star
system would indicate we are passing through the remnant of such an
event, and might lead other races to believe that this zone is vacant
of intelligent civilizations. Sounds like a 'zone of thought', eh?
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