| Jimmy, welcome to the toequest forums.
Einstein wrote a paper explaining that with relativity we would be able to determine who was correct, whether the ptolemaic system or the copernican, for the space-time continuous is relative. But still, ten years later, with general relativity, he finally proved it:
The earth goes around the sun and not the other way round because the mass of the sun is bigger that of the earth (these have been measured) and therefore the gravitational curvature of the sun is bigger than that of the earth, so the earth is atracted to the sun, but repelled due to it's momentum, and these balanced forces make the earth move eliptically (not completelly circular, this was proved by Kepler) around the sun. The case with the universe is a bit more complex but just the basic idea is given with this one. |