Why does universe does not colapse due to gravity?
This is a good question. The answer goes back to the creation of the universe: to the Big Bang. That explosion/expansion was so So SO powerful that it forced all matter and energy outwards with so much force, that the universe is still expanding from this force, 14 or so billion years later! The force of gravity is not enough even to have stopped this expansion. Of course, gravity IS pulling on everything, pulling in the direction of ‘together’, but we are still not sure if this force will ever be enough to completely stop this expansion. If it is able to stop it, then the universe will, over billions and billions of years, just collapse, like you have suggested. But the expansion may be rapid enough that it will never stop, and simply continue to slow, forever. The key question in physics is how much matter there is in the universe: how much total gravity there is. If we look at the matter we understand, we are fairly certain that there is not enough to stop the expansion. But there i
