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Re: New ozone layer data article

>An exploding star about 185 trillion miles away would create enough gamma
>radiation to thin the ozone for many years, he said.

As I recall, this is less than 35 light-years.  A nova within that
range would have left us at the middle of a huge and clearly visible
shell of gas that has never, to my knowledge, been reported by any
astronomers, nor have they identified any black holes or pulsars in
that range.  I don't have a star atlas here at work, but I can't even
recall a white dwarf star at that range, either.  Do we have any
evidence for this besides a really spiffy analysis of what the
radiation _might_ have done if it were close enough?  Do have any
real candidates for the dead star(s) and what extinctions they are
alleged to have participated in?

Larry Smith