Einstein's theory of general relativity predicts that massive objects warp the space-time around them. NASA's Gravity Probe B found that the space-time around Earth is indeed curved by our planet, and ...

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In November 1915, Albert Einstein put the finishing touches on his radical reinvention of space, time, gravity and the Universe itself. Throughout the following 100 years, experimenters have confirmed ...

Perhaps you’ve noticed all the fuss this week over Albert Einstein and his famous general theory of relativity, which turned 100 years old. Who better to give you a glimpse into what the theory is all ...

Answering some of the biggest questions in astrophysics—for example, about black holes and the origin of the universe—might require overhauling general relativity. In this artist’s illustration, ...