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Interstellar
GammaRayEarth
06/18/09

 

Artist's conception of gamma rays from a massive star explosion hitting the Earth's atmosphere. (The expanding shell is pictured as blue, but gamma rays are actually invisible.) The gamma rays initiate changes in the atmosphere that deplete ozone and create a brown smog of NO2.   Scientists say that a gamma-ray burst might have caused the Ordovician extinction 450 million years ago. Image Credit: NASA



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