On Mon, 6 Mar 2006 20:19:54 +0000, in uk.sci.astronomy , Mike Williams
wrote:

Wasn't it carl who wrote:

Also, another off the wall question.... I was reading about the
supernova/unusual explosion a week or two back, it got me thinking: how
close would such an event need to be in order to be seen on earth (in our
light polluted cities) by the naked eye. Would we ever see a very close one
during they daytime?

The guys who saw the crab supernova in the year 1054 reported that it
rivalled Venus in brightness and remained visible in daylight for 21
days. That one was at a distance of 6300 light years.

And for the record, we would indeed see a very close one, but only for
a short time, as the gamma radiation would probably kill us all
quickly.... :-)
Mark McIntyre
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