description General relativity Overview
General relativity describes gravity not as a force, but as the curvature of spacetime caused by mass and energy, influencing how objects move within it.
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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