Hey Fat Kid ive thought the very same thing about how the universe operates.

okay so everything is exerting the tiniest bit of gravitational pull on other objects in space, like the gravity of the sun pulls the earth towards it just a tiny bit constantly. Eventually after every big mass has been pulling other things towards themselves for thousands of billions of years all the matter of the universe would just be a big clump, but gravity keeps pulling making that mass denser and denser. Finally everything in the universe is condensed into that same tiny point that the big bang origionated from. Then BOOM the trillion year process starts all over again.