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Thread: do we know if the earth has ever been hit by a gamma ray burst

  1. #1 do we know if the earth has ever been hit by a gamma ray burst 
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    I was reading about wr104. Filix.


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    Gamma-ray burst - Wikipedia, the free encyclopedia

    All the time.


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  4. #3 Re: do we know if the earth has ever been hit by a gamma ray burst 
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    Thankyou mathman. I was thinking more of a direct hit from a close GRB. Like from wr 104. Or even closer like betelgeuse, if it does produce one. I don't know how one would tell if one like that has hit in the past. Would it leave a finger print? Filix.
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    Thankyou very much mathman. I quess I was thinking more about a close direct hit from a close gamma ray. Like wr 104. Or even betelgeuse. If it does produce one. I dont know how one could find out if one hit in the past. Would it leave a fingerprint of some sort? Filix.
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    Sorry about the double post. Filix.
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    Quote Originally Posted by filix View Post
    Thankyou very much mathman. I quess I was thinking more about a close direct hit from a close gamma ray. Like wr 104. Or even betelgeuse. If it does produce one. I dont know how one could find out if one hit in the past. Would it leave a fingerprint of some sort? Filix.
    I don't have a definite answer, but gamma ray effects are generally at the atomic, not nuclear level, so I suspect there would be no long term signature.
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    People are looking for nitrogen oxide signatures in ice cores caused by x-ray / gamma rays
    [0902.3446] An Antarctic ice core recording both supernovae and solar cycles
    I believe in nothing, but trust gravity to hold me down and the electromagnetic force to stop me falling through
    Physics is the search for the best model not the truth, as only mythical beings know that.
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    Thanks PetTastic. Nice link. Ice cores are very cool. Without doing any research, I think They have drilled to over a million years in antartica. Not that far back in Greenland? Filix.
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