hey , i was wondering if this would be true : at school we often tell us that the universe is in a constant expansion , that gravity only works on small scale distances, that most objects have a powerful cinetic energy that make them expand But now, even if the gravitational attraction between all the universes objects is fairly weak (big distances), it should still slowly decrease the universes expansion by decreasing the objects cinetic energy ? meaning that there will be a time T where most of the universes object will stop expanding ? And then most of this object will gain cinetic energy , but on the other direction (gravity), meaning that all of these objects would move back to reunite. and so it will form a very small , very dense object , and then re-explode like the bing bang , to start another cycle ? like if an universes has a cycle of : expanding , reuniting, and exploding Because to me that sounds more logic, than saying that it will expand to infinity. Because we would have to consider how come so much particules reunited itself in a small volume to then explose (big bang) ?