Quote Originally Posted by northstandhibby View Post
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Would you mind explaining the differences between expansion and gravity?

Cheers

glory glory
Gravity is a force that pulls things together, the more mass something has, the more gravitational attraction it will have. The sun has the most gravity in our solar system and that's why all the planets orbit it. It's only centrifugal force that stops us falling into it. Expansion is what causes the universe to expand and is basically the opposite of gravity. Nothing can travel quicker than the speed of light, but expansion causes space to expand quicker than the speed of light.
If the universe had more gravity than it currently has then it would have contracted into a Big Crunch before stars and planets had time to form. The same is true for expansion. The balance between the 2 forces are what gives us the current universe we have.