18 JAN 2013 by ideonexus
Einstein's Cosmological Constant
Georges Lemaitre was a pudgy, pinkish Belgian Jesuit abbe—a Catholic priest—who also happened to be a skilled astronomer. Lemaitre had noticed that Einstein's general theory of relativity would have implied that the universe was expanding but for a troublesome little mathematical term called the cosmological constant that Einstein had inserted into his equations. Lemaitre saw no convincing reason why the cosmological constant should be there. In fact, Einstein himself had originally calc...He put the constant into his theory to keep the Universe static, but observations demonstrated it was expanding, so he changed his theory to match the evidence.