Quote:
Originally Posted by photon
You could also ask why do solar systems stay together. The expansion is quite weak and is only significant over very long distances.. the distances between galactic clusters and greater. At "smaller" distances (like the distances between galaxies in galaxy clusters) gravity is stronger, so gravity dominates. Andromeda is moving towards us because gravity dominates at that scale.
Same thing for our solar system, the expansion is so weak at that scale the gravity of the sun dominates, or the electromagnetic, weak, and strong forces dominate at the size of our bodies.
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I do understand the power of gravity and even the possibilty that it can force matter to go faster than the speed of light (black holes)
But that balloon theory doesn't really do it for me as they left out gravity and the effects it has on galaxies.
I think a theory that gravity and massive black holes are pulling galaxies apart is better than the total unexplained balloon theory.