Who developed the theory of general relativity?
Quick answer
Albert Einstein developed the theory of general relativity, completing it in November 1915. It explains gravity not as a pulling force, but as the bending of space and time (spacetime) by mass and energy. Objects like planets and light follow curved paths through that bent spacetime.
The big idea
Imagine a stretched rubber sheet. Put a heavy ball in the middle and the sheet sags. Roll a marble nearby and it curves toward the ball, not because the ball pulls it, but because the sheet is bent. In general relativity, mass bends spacetime, and that curvature is what we feel as gravity.
Special vs general relativity
| Special relativity (1905) | General relativity (1915) | |
|---|---|---|
| Deals with | Motion at constant speed, especially near the speed of light | Gravity and acceleration |
| Famous result | E = mc²; time slows at high speed | Gravity is curved spacetime |
How it was tested
| Prediction | Confirmed |
|---|---|
| Light bends around the Sun | 1919 solar eclipse expedition led by Arthur Eddington |
| Mercury’s orbit shifts slightly over time | Explained a long-standing puzzle |
| Clocks run slower in stronger gravity | Measured by precise clocks on Earth and in satellites |
| Gravitational waves, ripples in spacetime | Detected by LIGO in 2015, announced in 2016 |
| Black holes | First image in 2019; see what an event horizon is |
Why it matters in daily life
GPS satellites must correct their clocks for both special and general relativity; otherwise your map location would drift by kilometers a day. See what GPS stands for.
A Nobel surprise
Einstein won the 1921 Nobel Prize in Physics, but not for relativity, which was still debated. The prize was for his explanation of the photoelectric effect, which helped found quantum physics.
For Einstein’s famous quote about imagination, which he said in 1929, see who said “Imagination is more important than knowledge”. Newton’s earlier laws still work well for everyday speeds: Newton’s three laws of motion.
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