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On 2002-12-24 10:21, irony wrote:
I suppose a galaxy could 'die out' when all of the stuff in it is in the form of stellar remnants, planets, and brown dwarfs (is it 'brown dwarfs' or 'brown dwarves?' I know that on Discworld it's 'dwarfs,' in Middle-Earth its 'dwarves'... what is it in outer space?) so there's nothing left to shine. But I couldn't even venture a guess as to how long that would take.
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Besides the length of time, such a "dead galaxy" would have much less hydrogen and much more helium than has ever been observed. This is probably another piece of evidence against the steady state theory, that we don't see large patches with such a large helium signature.