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  1. 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 …

  2. 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 …

  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. Relativity | Institute of Physics

    In his special relativity theory, Einstein instead showed that the laws of physics and, crucially, the speed of light are the things that are constant. Fixing these meant that time and space could …

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

    Nov 25, 2023 · Relativity, comprising Albert Einstein’s theories of special and general relativity, revolutionized our understanding of space, time, mass, energy, and gravity.

  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. 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.

  10. 5: Relativity - Physics LibreTexts

    Relativity is the study of how observers in different reference frames measure the same event. Modern relativity is divided into two parts. Special relativity deals with observers in uniform …