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  2. Many-worlds interpretation - Wikipedia

    en.wikipedia.org/wiki/Many-worlds_interpretation

    The quantum-mechanical "Schrödinger's cat" paradox according to the many-worlds interpretation.In this interpretation, every quantum event is a branch point; the cat is both alive and dead, even before the box is opened, but the "alive" and "dead" cats are in different branches of the multiverse, both of which are equally real, but which do not interact with each other.

  3. Olbers's paradox - Wikipedia

    en.wikipedia.org/wiki/Olbers's_Paradox

    The redshift hypothesised in the Big Bang model would by itself explain the darkness of the night sky even if the universe were infinitely old. In the Steady state theory the universe is infinitely old and uniform in time as well as space. There is no Big Bang in this model, but there are stars and quasars at arbitrarily great distances.

  4. Heat death paradox - Wikipedia

    en.wikipedia.org/wiki/Heat_death_paradox

    Assuming that the universe is eternal, a question arises: How is it that thermodynamic equilibrium has not already been achieved? [4]This theoretical paradox is directed at the then-mainstream strand of belief in a classical view of a sempiternal universe, whereby its matter is postulated as everlasting and having always been recognisably the universe.

  5. Quantum suicide and immortality - Wikipedia

    en.wikipedia.org/wiki/Quantum_suicide_and...

    Hugh Everett did not mention quantum suicide or quantum immortality in writing; his work was intended as a solution to the paradoxes of quantum mechanics. Eugene Shikhovtsev's biography of Everett states that "Everett firmly believed that his many-worlds theory guaranteed him immortality: his consciousness, he argued, is bound at each branching to follow whatever path does not lead to death". [5]

  6. Kalam cosmological argument - Wikipedia

    en.wikipedia.org/wiki/Kalam_cosmological_argument

    "Even if the universe has a beginning in time, in the light of recently proposed cosmological theories this beginning may be uncaused. Despite Craig's claim that theories postulating that the universe 'could pop into existence uncaused' are incapable of 'sincere affirmation,' such similar theories are in fact being taken seriously by scientists."

  7. List of superseded scientific theories - Wikipedia

    en.wikipedia.org/wiki/List_of_superseded...

    Luminiferous aether theory; Static Universe theory [14] Steady state theory, a model developed by Hermann Bondi, Thomas Gold, and Fred Hoyle whereby the expanding universe was in a steady state, and had no beginning. It was a competitor of the Big Bang model until evidence supporting the Big Bang and falsifying the steady state was found.

  8. 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.

  9. Multiverse - Wikipedia

    en.wikipedia.org/wiki/Multiverse

    A common feature of all four multiverse levels is that the simplest and arguably most elegant theory involves parallel universes by default. To deny the existence of those universes, one needs to complicate the theory by adding experimentally unsupported processes and ad hoc postulates: finite space, wave function collapse and ontological ...