Quote (ChaosDealer73 @ Wed, Dec 10 2008, 07:23pm)
If I remember correctly, they are attributing both expansion and contraction to black holes and other things of massive gravity that distort space time. Although black holes absorb matter, they do constantly loose some of their density, when there is nothing left to absorb, they only get smaller in size. This plays into the safety of creating black holes on earth, they would be so small they would instantly disappear. There is some other theory out there that says that when then last black hole ceases to exist, so will the universe. If you look at black holes in the common diagrams, they are marked by severe alterations to space time. See image:
http://www.upscale.utoronto.ca/GeneralInterest/Harrison/BlackHoles/transp8.2.gifThat would act as grounding. Think of it as putting a pin through a sheet of paper on a bulletin board, as the pin is slowly removed, the piece of paper loses its connection to the lower piece. When the grounding ceases to exist (as in there are no more black holes) the universe will simply fall apart. I don't know if I buy into that idea, and it was really confusing to read about and I probably rephrased it wrong, but it is an interesting theory.
Another theory is that eventually one black hole will absorb all the information in this universe. All that information will be ejected into a parallel universe or it will recreate the conditions prior to the big bang. When the ultra black hole no longer can support its own massive gravity, it will explode, similar to the big bang.
Edit: Whoops. Didn't see your last post, Paul. Hehe.
meh, the parallel universe theory sounds very rediculous to me. Something alike it may exist, but I highly doubt its the way they explain it. However, sinse a lot of these galaxies rotate around these black holes like we do around our sun, it is very possible that studying them will help us to discover where gravity comes from. ^^