Excuse me for my ignorance but I really couldn't find a solution. According to Einstein, every happening is possible to describe by both of interacted objects.
- Is there any other way to describe the Big bang than the one that describes the rapid expansion of the universe?
- I just read that Kepler's laws were proof that geocentrism is not true. But according to Einstein, gravity is reciprocal effect of two curvature of space. It is therefore relative, if we live in a heliocentric or geocentric system?