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2019-02-07: Sound Waves from the Beginning of Time
05:57
: But the plasma, now hydrogen and
helium gas,
stalled.
2017-05-31: The Fate of the First Stars
02:32
: ... in the first ever proto galaxies, born of the pristine hydrogen and
helium gas
that filled the universe soon after the Big ...
07:22
: But without materials to help cooling, a giant cloud of pristine hydrogen
helium gas
can't shed its heat quickly enough.
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