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  2. Big Bang - Wikipedia

    en.wikipedia.org/wiki/Big_Bang

    The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The concept of an expanding universe was scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations .

  3. Cosmogony - Wikipedia

    en.wikipedia.org/wiki/Cosmogony

    The Big Bang theory, which explains the Evolution of the Universe from a hot and dense state, is widely accepted by physicists.. In astronomy, cosmogony is the study of the origin of particular astrophysical objects or systems, and is most commonly used in reference to the origin of the universe, the Solar System, or the Earth–Moon system.

  4. Big Bang nucleosynthesis - Wikipedia

    en.wikipedia.org/wiki/Big_Bang_nucleosynthesis

    Without major changes to the Big Bang theory itself, BBN will result in mass abundances of about 75% of hydrogen-1, about 25% helium-4, about 0.01% of deuterium and helium-3, trace amounts (on the order of 10 −10) of lithium, and negligible heavier elements. That the observed abundances in the universe are generally consistent with these ...

  5. Cyclic model - Wikipedia

    en.wikipedia.org/wiki/Cyclic_model

    A cyclic model (or oscillating model) is any of several cosmological models in which the universe follows infinite, or indefinite, self-sustaining cycles. For example, the oscillating universe theory briefly considered by Albert Einstein in 1930 theorized a universe following an eternal series of oscillations, each beginning with a Big Bang and ending with a Big Crunch; in the interim, the ...

  6. History of the Big Bang theory - Wikipedia

    en.wikipedia.org/wiki/History_of_the_Big_Bang_theory

    The theory he devised to explain what he found is called the Big Bang theory. [citation needed] In 1931, Lemaître proposed in his "hypothèse de l'atome primitif" (hypothesis of the primeval atom) that the universe began with the "explosion" of the "primeval atom" – what was later called the Big Bang.

  7. ‘Big Bang Theory’ Alum John Ross Bowie Joins Spinoff in ...

    www.aol.com/big-bang-theory-alum-john-173138756.html

    In “The Big Bang Theory,” Kripke was a fellow physicist at Cal-Tech and a frequent rival of Sheldon’s. Bowie originally joined the series in Season 2 and went on to appear in the show ...

  8. Copernican principle - Wikipedia

    en.wikipedia.org/wiki/Copernican_principle

    While the Big Bang model in cosmology is sometimes said to derive from the Copernican principle in conjunction with redshift observations, the Big Bang model can still be assumed to be valid in absence of the Copernican principle, because the cosmic microwave background, primordial gas clouds, and the structure, evolution, and distribution of ...

  9. Big Bang Theory’s John Ross Bowie to Reprise Barry ... - AOL

    www.aol.com/entertainment/big-bang-theory-john...

    The Big Bang Theory spinoff at Max continues to assemble the Avengers of recurring characters. John Ross Bowie is set to reprise his fan-favorite role as Barry Kripke in the as-yet-untitled ...