‘I love the idea that this basic principle that Einstein told us about a long time ago is something you can see,’ CU Boulder astrophysicist says Scientists who study the cosmos have a favorite ...

In Newtonian physics, space and time had their independent identities, and nobody ever got them mixed up. It was with the theory of relativity, put together in the early 20th century, that talking ...

After two eclipse expeditions confirmed Einstein's theory of general relativity, the scientist became an international celebrity. The New York Times Archives / Photo Illustration by Shaylyn Esposito ...