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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
In fact rather the oppostie - we are in a rather 'clear' region.
> 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.
I can think of two white dwarfs in that range, however - Procyon B
and Sirius B. However, these were probably formed largely by
mass transfer, perhaps with some planetary nebula emissions thrown
many long ages ago.
The peace of God be with you.