  == Rewrite of the article ==  I have decided to insert a version of the equivalence principle article. The   main goal is to have an article that is in conformance with the wikipedia article on gravity. A lot of what I write is derived from that article. The basis of the equivalence principle is Einstein's 1907 vision that gravitational interaction is mediated by changing the rate of time, by curving space-time geometry. Then and only then can the effects of acceleration cancel the effects of gravitation. Everything else follows from that. Every interaction has a mediator. In the case of gravitation curvature of space-time is that mediator.  |  