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  2. Non-standard cosmology - Wikipedia

    en.wikipedia.org/wiki/Non-standard_cosmology

    The few Big Bang opponents still active today often ignore well-established evidence from newer research, and as a consequence, today non-standard cosmologies that reject the Big Bang entirely are rarely published in peer-reviewed science journals but appear online in marginal journals and private websites.

  3. Cosmic microwave background - Wikipedia

    en.wikipedia.org/wiki/Cosmic_microwave_background

    The CMB is landmark evidence of the Big Bang theory for the origin of the universe. In the Big Bang cosmological models, during the earliest periods, the universe was filled with an opaque fog of dense, hot plasma of sub-atomic particles. As the universe expanded, this plasma cooled to the point where protons and electrons combined to form ...

  4. Discovery of cosmic microwave background radiation - Wikipedia

    en.wikipedia.org/wiki/Discovery_of_cosmic...

    [1] [2] The new measurements were accepted as important evidence for a hot early Universe (big bang theory) and as evidence against the rival steady state theory [3] as theoretical work around 1950 [4] showed the need for a CMB for consistency with the simplest relativistic universe models.

  5. Big Crunch - Wikipedia

    en.wikipedia.org/wiki/Big_Crunch

    The Big Crunch is a hypothetical scenario for the ultimate fate of the universe, in which the expansion of the universe eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor to reach absolute zero, an event potentially followed by a reformation of the universe starting with another Big Bang.

  6. 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.

  7. Kalam cosmological argument - Wikipedia

    en.wikipedia.org/wiki/Kalam_cosmological_argument

    In the B-theory, temporal passage and becoming are subjective and illusions of consciousness. Craig explains: [38] "On a B-Theory of time, the universe does not in fact come into being or become actual at the Big Bang; it just exists tenselessly as a four-dimensional space-time block that is finitely extended in the earlier than direction.

  8. Anthropic principle - Wikipedia

    en.wikipedia.org/wiki/Anthropic_principle

    This discovery was unequivocal evidence that the universe has changed radically over time (for example, via the Big Bang). [ citation needed ] Carter defined two forms of the anthropic principle, a "weak" one which referred only to anthropic selection of privileged spacetime locations in the universe, and a more controversial "strong" form that ...

  9. Steady-state model - Wikipedia

    en.wikipedia.org/wiki/Steady-state_model

    In cosmology, the steady-state model or steady state theory is an alternative to the Big Bang theory. In the steady-state model, the density of matter in the expanding universe remains unchanged due to a continuous creation of matter, thus adhering to the perfect cosmological principle , a principle that says that the observable universe is ...