Some Time On Earth (Or Something Like Earth)

Monday, April 11, 2005

gamma rays strike again

250 million years ago, cosmic rays from a stellar explosion 6000 light years away bathed the earth stripping away the protective veneer of the ozone and killed ninety percent of life on the planet. this past december the earth was again bathed in a weak tea swath of gamma rays from an explosion that was 25,000 light years away, so we were lucky there. Next time we may not be so lucky.


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