Most people only credit gravity to keeping us grounded to the earth, however, gravity does so much more.
Gravity is actually a law of physics saying that all object with mass attract each other. The more the mass the stronger the attraction. Like the Suns gravitational force is stronger than the earths. And your gravitational force can't even move a piece of paper.
Now how does gravity affect the Universe? It pulls everything together, without gravity nothing would stay together. There would be a scattered cloud of molecules.
Tell me if you need more details!
