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What is the theory of relativity?

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Quick answer

Einstein's theory of relativity reshaped how we understand space, time, and gravity. It shows that time and space are linked and can stretch or shrink, and that gravity is the bending of spacetime by mass — explaining everything from GPS to black holes.

Key things to understand

  1. Proposed by Albert Einstein in the early 1900s.
  2. Special relativity: space and time are linked and relative.
  3. General relativity: gravity is the bending of spacetime by mass.
  4. It explains GPS corrections, black holes, and the cosmos.

People also ask

What is the theory of relativity in simple terms?
Einstein's idea that space and time are linked and flexible, and that gravity bends the fabric of spacetime.
What's the difference between special and general relativity?
Special relativity deals with motion and the speed of light; general relativity explains gravity as curved spacetime.
Why does relativity matter day to day?
GPS satellites must correct for relativity's effects on time, or your location would quickly drift off.