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  1. Cosmology | Definition & Facts | Britannica

    Nov 14, 2025 · Cosmology, the field of study that brings together the natural sciences, particularly astronomy and physics, in a joint effort to understand the physical universe as a unified whole.

  2. Astronomy - Cosmology, Universe, Stars | Britannica

    Sep 23, 2025 · Cosmology is the scientific study of the universe as a unified whole, from its earliest moments through its evolution to its ultimate fate. The currently accepted cosmological …

  3. Importance of cosmology and its three eras | Britannica

    cosmology, Field of study that brings together the natural sciences, especially astronomy and physics, in an effort to understand the physical universe as a unified whole.

  4. Cosmology - Big Bang, Expansion, Dark Energy | Britannica

    Nov 14, 2025 · Cosmology - Big Bang, Expansion, Dark Energy: To derive his 1917 cosmological model, Einstein made three assumptions that lay outside the scope of his equations.

  5. Bing | Description & History | Britannica Money

    5 days ago · Bing, search engine launched in 2009 by the American software company Microsoft Corporation. Microsoft’s previous search engine, Live Search, from the time of its release in …

  6. Astronomy | Definition, History, Discoveries, & Facts | Britannica

    Nov 14, 2025 · Concerned with phenomena on the largest scale is cosmology, the study of the evolution of the universe. Astrophysics has transformed cosmology from a purely speculative …

  7. Find Definitions & Meanings of Words | Britannica Dictionary

    1 day ago · Clear and simple definitions in American English from Britannica's language experts. More usage examples than any other dictionary.

  8. Gene | Definition, Structure, Expression, & Facts | Britannica

    6 days ago · Gene, unit of hereditary information that occupies a fixed position on a chromosome. Genes achieve their effects by directing the synthesis of proteins. They are composed of …

  9. A Definition & Meaning | Britannica Dictionary

    A meaning: 1 : the first letter of the English alphabet; 2 : a musical note or key referred to by the letter A the sixth tone of a C-major scale

  10. Light | Definition, Properties, Physics, Characteristics, Types ...

    Nov 25, 2025 · Light, electromagnetic radiation that can be detected by the human eye.