Einstein’s general theory of relativity can be summed up ... That explains why we feel a downwards pull towards Earth and why Earth orbits the sun. Although gravity is dominant over large ...

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 ...