Over the last five years, a NASA satellite has recorded more than 1,700 massive bursts of gamma rays all over the sky. At times, it seems there are almost as many theories for what is causing the bursts. Now, however, several astrophysicists argue that the evidence is becoming stronger and stronger that the sources lie far beyond the Milky Way. Two papers presented to the American Astronomical Society add weight to the case for the mysterious bursts originating billions of ...

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