Einstein predicted that massive objects bend light as it passes through their gravitational field. This week, a new telescope ...

Time moves just a tad faster on the Moon, where gravity is one-sixth that of Earth ... theory of general relativity, one of the best tested theories that we have that explains the fabric of ...

For six minutes, the longest eclipse since 1416, the Moon would completely block the face of the Sun, pulling a curtain of darkness over a thin stripe of Earth. Eddington traveled into the eclipse ...

On 25 November 1915, Albert Einstein presented his general theory of relativity at the Prussian ... This is why the Earth goes around the Sun in a circular orbit rather than flying out of the ...

The five planets that adorned the morning sky last month are now going their separate ways. Mercury slips behind the sun on March 23, and Venus glides into the sun’s foreglow as it heads for ...