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

    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 frames of …

  2. Theory of relativity - Wikipedia

    The theory of relativity comprises two physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. [1] Special relativity …

  3. What Is Relativity? Einstein’s Groundbreaking Theory Explained

    May 5, 2025 · General relativity extended the principle of relativity to include acceleration and redefined gravity not as a force, but as a geometric property of spacetime. Einstein’s central …

  4. DOE Explains...Relativity - Department of Energy

    Relativity is two related theories: special relativity, which explains the relationship between space, time, mass, and energy; and general relativity, which describes how gravity fits into the mix.

  5. Relativity - Learn Physics

    Relativity is a fundamental theory in physics developed by Albert Einstein that describes the relationship between space, time, and gravity. There are two main aspects of relativity: Special …

  6. What is the theory of general relativity? Understanding …

    Oct 29, 2024 · Albert Einstein's theory of general relativity is based on the idea that massive objects cause a distortion in space-time, which is felt as gravity

  7. What is Einstein's Theory of Relativity? - Universe Today

    Jan 28, 2022 · But the most famous and renowned is arguably Albert Einstein, Relativity, and the famous equation, E=mc2. In fact, Relativity may be the best-known scientific concept that few …

  8. Special relativity - Wikipedia

    The principle of relativity, forming one of the two postulates of special relativity, was described by Galileo Galilei in 1632 using a thought experiment involving observing natural phenomena on …

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

    The answer is that Newton’s theory violates special relativity, for it requires an unspecified “action at a distance” through which any two objects—such as the Sun and Earth—instantaneously …

  10. Einstein States His Theory of Special Relativity - EBSCO

    Albert Einstein's special theory of relativity, first published in 1905, fundamentally altered our understanding of time, space, and energy. In this groundbreaking work, Einstein proposed that …