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  2. Olbers's paradox - Wikipedia

    en.wikipedia.org/wiki/Olbers's_Paradox

    The paradox is that a static, infinitely old universe with an infinite number of stars distributed in an infinitely large space would be bright rather than dark. [1] A view of a square section of four concentric shells. To show this, we divide the universe into a series of concentric shells, 1 light year thick.

  3. 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 ...

  4. 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.

  5. Shape of the universe - Wikipedia

    en.wikipedia.org/wiki/Shape_of_the_universe

    One of the unanswered questions about the universe is whether it is infinite or finite in extent. For intuition, it can be understood that a finite universe has a finite volume that, for example, could be in theory filled with a finite amount of material, while an infinite universe is unbounded and no numerical volume could possibly fill it.

  6. Eternal inflation - Wikipedia

    en.wikipedia.org/wiki/Eternal_inflation

    Every experiment that brings better credence to inflationary theory brings us much closer to hints that the multiverse is real." [21] In 2018 the late Stephen Hawking and Thomas Hertog published a paper in which the need for an infinite multiverse vanishes as Hawking says their theory gives universes which are "reasonably smooth and globally ...

  7. Conformal cyclic cosmology - Wikipedia

    en.wikipedia.org/wiki/Conformal_cyclic_cosmology

    Conformal cyclic cosmology (CCC) is a cosmological model in the framework of general relativity and proposed by theoretical physicist Roger Penrose. [1] [2] [3] In CCC, the universe iterates through infinite cycles, with the future timelike infinity (i.e. the latest end of any possible timescale evaluated for any point in space) of each previous iteration being identified with the Big Bang ...

  8. 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."

  9. Static universe - Wikipedia

    en.wikipedia.org/wiki/Static_universe

    In cosmology, a static universe (also referred to as stationary, infinite, static infinite or static eternal) is a cosmological model in which the universe is both spatially and temporally infinite, and space is neither expanding nor contracting. Such a universe does not have so-called spatial curvature; that is to say that it is 'flat' or ...