General relativity provides a framework for studying the behavior of the universe as a whole, particularly on the largest scales. The theory predicts the expansion of the universe, the existence of dark matter and dark energy, and the behavior of black holes, among other phenomena. However, General relativity is not sufficient to explain all aspects of the universe, particularly on very small scales, where the effects of quantum mechanics become important. The merging of General relativity and quantum mechanics, known as quantum gravity, is an active area of research, and it is hoped that a complete theory will eventually be developed that can explain all phenomena at all scales.\n
Can General relativity be used to explain the behavior of the universe as a whole?