empty2:
Usually when astronomers are discussing this sort of thing it is in
relation to the ultimate expansion, or contraction of the universe.
Without anyone to measure things, I can't see how this much matters,
but this is of intense interest to astronomy and physics. There is
real interest in what things will look like fifty billion years from
now, but who is timing this thing? So, the items mentioned in the
quote all contribute to this endless expansion, or the eventual
collapse to a singularity. Someone else will be much more
knowledgeable than I, but I believe that with high mass comes
collapse, but they seem to be finding that the expansion is
accelerating. I believe that this is where they suggest that there is
something called "dark energy". DK is supposedly pulling counter to
gravity and is responsible for the measured acceleration. Of course,
scientist don't really measure speed, or acceleration..it is all
inferred based upon their measurements and underlying assumptions.
So, assumptions underly all of this.. sound familiar?