BOULDER- Black holes, time travel and E= mc^2. They are all related to Albert Einstein's Theory of Relativity. How many of us, though, can actually explain any of it? This year, Einstein's theory ...

Relativity Space made a flurry of announcements on Wednesday about its past and future. The company is going bigger, and it has already started to do so. In an interview with Ars, the company’s chief ...

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Einstein's theory of general relativity has passed its toughest test with flying colors, a new study reports. General relativity, which Einstein proposed in 1916, holds that gravity is a consequence ...