Thursday, January 05, 2006

Old stars and mysterious cosmic explosions



'Cosmic gamma-ray bursts, the most powerful explosions in the universe, have the extreme brilliance of a billion billion Suns and occur several times a day. But they are not all created equal. For several decades astronomers have known that two types exist--long ones that last for tens or hundreds of seconds, and short bursts, which last a few milliseconds to a second.' More

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