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Gravity is the answer. It's just that there is the possibility for gravity to, at long distances, drive things apart. This is either due to a purely mathematical feature of gravity or is it is because of the way that the energy of empty space interacts with gravity. We are not sure which yet and we may never be sure.

If there is no "Negative Gravity", what is accelerating expansion of the Universe? I have tried to find an answer to this but have been unable to do so as yet. Thanks for comments.

Einstein was talking about the innate stress-energy of space, stress is akin to pressure, and you know that things that are under pressure will expand unless constrained.

Joe: check my answer out elsewhere. You might find people saying they wouldn't express it in quite the same terms but it's a reasonable reasoned answer.

Quote from: Farsight on 13/02/2010 15:01:57Joe: check my answer out elsewhere. You might find people saying they wouldn't express it in quite the same terms but it's a reasonable reasoned answer. I also urge this. If you are truly interested in gravitational physics, then hit the books. You will find far more satisfaction than hand-waiving answers. You will definitely find that Farsight's answer has no content.

What if everything is just getting smaller by the same rate