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  1. Theory of relativity - Wikipedia

    The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, …

  2. 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 …

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

    May 5, 2025 · Today, the word “relativity” is nearly synonymous with Einstein, yet few grasp the depth and elegance of his ideas. In this comprehensive exploration, we will journey through …

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

    Oct 29, 2024 · General relativity is physicist Albert Einstein's understanding of how gravity affects the fabric of space-time. The theory, which Einstein published in 1915, expanded the theory of …

  5. Relativity Explained | Time-Space Theory & Impact

    May 27, 2024 · The theory of relativity, introduced by Albert Einstein in the early 20th century, revolutionized our understanding of space, time, and gravity. This groundbreaking theory is …

  6. 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.

  7. Science Made Simple: What Is the Theory of Relativity?

    Nov 25, 2023 · What Is the Theory of Relativity? Relativity is two related theories: special relativity, which explains the relationship between space, time, mass, and energy; and general …

  8. 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 …

  9. How to understand Einstein’s relativity without math - Big Think

    21 hours ago · Times dilate and lengths contract near the speed of light. Bizarre and confusing? Sure. But under relativity, it can't be any other way.

  10. General Relativity and the Nature of Spacetime - NASA Science

    Sep 16, 2025 · General Relativity and the Nature of Spacetime Test the validity of Einstein's General Theory of Relativity and investigate the nature of spacetime Einstein's General …