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We
don't
know
what
triggered
the
big
bang,
nor
what,
if
anything,
existed
before
it.
But
somehow
the
universe
emerged
as
a
vast
sea
of
ultrahot
gas,
expanding
fast
in
all
directions
like
the
fireball
ignited
by
a
nuclear
bomb
blast
or
by
the
explosion
of
a
gas
pipeline.
Except
that
the
big
bang
was
not
destructive
(so
far
as
we
know).
Instead,
it
created
everything
in
our
universe,
or
rather
the
seeds
for
everything.
The replay is still saving.