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From the point of cosmology *THIS* Universe (there may be many others) was
"created" ex nihilo ~15billion years ago -- at a *point* of zero volume.
Since then, this Universe has been expanding BUT it is not expanding into
some extant space -- it is creating its OWN space ie space is expanding as
well and the stuff of this Universe is expanding into this expanding space.
At first this space expanded faster [could one say >c? and have that be
understood?] than the stuff of the Universe (there were yet no galaxies or
even nebulae at this time). The rate of expansion of space is decreasing.
There is a debate as to whether the things (galaxies, etc) of the Universe
will catch up or not OR if the things of the Universe will collapse in
several billion years OR if space will collapse back to a point.