This is the reply i posted on ilovephysics.com
This is a reply i posted on ilovephysics.com
Wouldnt gravity have to win? This is the same as throwing a ball into the air. The ball does accelerate towards the sky, but the rate of acceleration decreases, until a=0. Of course, at this point the ball accelerates towards the ground. I would imagine the universe would do the same thing. There is no force that i know of keeping the universe at a constant rate of expansion. There is a force slowing down the rate of expansion. Gravity. Eventually the universe should collapse on itself.
The only way i can picture this not happening is if the big bang is still happening. I read on Einstein@home that the big bang was an explosion of space itself, not matter. Whos to say this "explosion of space" is not still happening? If its still happening i would imagine that mass would fall back on itself in isolated places far from the big bang. But because of the curvatur of the entire universe due to an ever expanding universe, the universe would never completely colapse on itself.
Or am i missing the point and its a given that the big bang is still happening???