Glossary term: Theory Of General Relativity

Description: (The Theory of) General Relativity, published in 1915, is Albert Einstein's theory linking space, time, and gravity. In that theory, gravity is not an ordinary force. Instead, a mass or other source of gravity will distort space and time in its vicinity. This distortion changes how bodies in free fall move. For instance, when a planet orbits the Sun, it's not because of an attractive force – it's because the planet is taking the straightest possible path through space and time (or more precisely: through "spacetime", since in Einstein's theory, there is no unique way of separating space from time). Einstein's theory predicts small corrections to the orbits of astronomical objects, gravitational lensing, black holes, gravitational waves, and the cosmological models for expanding universes.

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