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  1. Relativity | Definition, Equations, & Facts | Britannica

    Oct 24, 2025 · Relativity, wide-ranging physical theories formed by the German-born physicist Albert Einstein. Special relativity is limited to objects that are moving with respect to inertial …

  2. Relativity - Space-Time, Gravity, Physics | Britannica

    Oct 24, 2025 · General relativity is expressed in a set of interlinked differential equations that define how the shape of space-time depends on the amount of matter (or, equivalently, …

  3. Relativistic mechanics | Einstein’s Theory of Relativity | Britannica

    The requirement that the laws of physics take the same form in all inertial reference frames related by Lorentz transformations is called for the sake of brevity the requirement of …

  4. General relativity | Gravitational Waves, Spacetime & Cosmology ...

    Nov 5, 2025 · It was conceived by Einstein in 1916. General relativity is concerned with gravity, one of the fundamental forces in the universe. Gravity defines macroscopic behaviour, and so …

  5. Relativity - Time, Space, Mass | Britannica

    Oct 24, 2025 · Relativity - Time, Space, Mass: Scientists such as Austrian physicist Ernst Mach and French mathematician Henri Poincaré had critiqued classical mechanics or contemplated …

  6. relativity summary | Britannica

    relativity, Concept in physics that measurements change when considered by observers in various states of motion. In classical physics, it was assumed that all observers anywhere in the …

  7. Special relativity | Definition & Equation | Britannica

    Nov 12, 2025 · special relativity, part of the wide-ranging physical theory of relativity formed by the German-born physicist Albert Einstein. It was conceived by Einstein in 1905. Along with …

  8. How Albert Einstein Developed the Theory of General Relativity

    Black holes and the expanding universe are two concepts that have their roots in general relativity. Even GPS satellites must account for general relativistic effects to deliver accurate …

  9. Relativity - Physics, Time, Space | Britannica

    Oct 24, 2025 · The ideas of relativity were widely applied—and misapplied—soon after their advent. Some thinkers interpreted the theory as meaning simply that all things are relative, …

  10. E = mc² | Equation, Explanation, & Proof | Britannica

    Nov 23, 2025 · What influence did Albert Einstein have on science? Albert Einstein had a massive influence on contemporary physics. His theory of relativity shifted contemporary understanding …