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  1. Dictionary
    cosmic
    /ˈkɒzmɪk/

    adjective

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    More definitions, origin and scrabble points

  2. www.britannica.com › science › cosmology-astronomyCosmology | Definition & Facts | Britannica

    Jun 28, 2024 · 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. When the universe is viewed in the large, a dramatic new feature, not present on small scales, emerges—the cosmological expansion.

  3. en.wikipedia.org › wiki › UniverseUniverse - Wikipedia

    3 days ago · The cosmological horizon, also called the particle horizon or the light horizon, is the maximum distance from which particles can have traveled to the observer in the age of the universe. This horizon represents the boundary between the observable and the unobservable regions of the universe.

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  5. www.britannica.com › science › universeUniverse | Definition & Facts | Britannica

    Jul 4, 2024 · universe, the whole cosmic system of matter and energy of which Earth, and therefore the human race, is a part. Humanity has traveled a long road since societies imagined Earth, the Sun , and the Moon as the main objects of creation, with the rest of the universe being formed almost as an afterthought.

    • Frank H. Shu

  6. www.britannica.com › science › cosmic-rayCosmic ray | Definition, Types, Effects, & Facts | Britannica

    6 days ago · Cosmic ray, a high-speed particle—either an atomic nucleus or an electron—that travels through space. Most of these particles come from sources within the Milky Way Galaxy and are known as galactic cosmic rays (GCRs). The rest of the cosmic rays originate either from the Sun or, almost certainly in.

  7. en.wikipedia.org › wiki › AstronomyAstronomy - Wikipedia

    4 days ago · Based on strict dictionary definitions, "astronomy" refers to "the study of objects and matter outside the Earth's atmosphere and of their physical and chemical properties", while "astrophysics" refers to the branch of astronomy dealing with "the behavior, physical properties, and dynamic processes of celestial objects and phenomena".

  8. spaceplace.nasa.gov › big-bang › enWhat Is the Big Bang? | NASA Space Place – NASA Science for Kids

    Jul 9, 2024 · The Short Answer: The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!

  9. www.scienceforthepublic.org › things-to-know › cosmosCosmos: The Big Bang | Science for the Public

    Jun 22, 2024 · Cosmos: The Big Bang. The universe emerged instantaneously some 13.7 billion years ago in a unique kind of explosion known as the Big Bang. Two features of that creation are mysteries for science. The first is that speed of the explosion, which was an acceleration from nothing and greater than the laws of physics allow.