description General relativity Overview
Gravity takes a geometric form in Einstein's general relativity: matter and energy affect the curvature of spacetime, and that geometry shapes motion. Freely falling objects follow the straightest available paths through curved spacetime. Light also follows paths determined by this geometry, which explains why gravity can bend its apparent direction even though light has no rest mass. The theory provides a foundation for studying black holes and the development of the universe on large scales.
It also explains astronomical effects that Newtonian gravity cannot fully account for, including aspects of planetary motion and the behavior of clocks in different gravitational conditions. Physicists and astronomers use it to connect observations with mathematical models. Its defining departure from classical gravity is the treatment of spacetime as an active part of the physical system, rather than a fixed stage on which forces act.
help General relativity FAQ
What does general relativity say gravity is?
General relativity describes gravity as the curvature of spacetime caused by mass and energy. Albert Einstein published the theory in 1915.
What evidence first supported general relativity?
The 1919 solar eclipse expedition led by Arthur Eddington measured starlight bending near the Sun. The result helped make Einstein internationally famous.
How is general relativity different from Newtonian gravity?
Newton treated gravity as a force acting between masses, while Einstein described objects following paths through curved spacetime. Newton's equations still work very well for everyday speeds and weak gravity.
Where is general relativity used today?
General relativity is needed for black holes, gravitational waves, cosmology, and precise GPS timing. LIGO first detected gravitational waves in 2015 from merging black holes.
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