In general relativity, gravity is modeled as a curvature in spacetime. So the earth moves in a 'straight' path in a curved space. At least, this is how it has been explained to me in the past. The sun isn't actually 'pulling' on the earth, the earth is just moving around in the 'gravitational well' of the sun. So in this sense, there is no 'force' of gravity is there? It's just a dynamic of spacetime. I don't understand how gravity can be one of the four forces of nature if it's just curved spacetime. How is gravity still a force in general relativity?