SUMMARY: Just a few hundred millions years after the Big Bang, a massive star exhausted its fuel, collapsed as a black hole, and exploded as a gamma ray burst. The radiation from this catastrophic event has only now reached Earth, and astronomers are using it to peer back to the earliest moments of the Universe. The burst, named GRB 050904, was observed by NASA's Swift satellite on September 4, 2005. One unusual thing about this burst is that it lasted for 500 seconds - most are over in a fraction of that time.
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