Open questions about the whole universe: Olbers' paradox about why the night sky is dark, the heat death as a possible end state and the hypothesis of a multiverse. A concept belongs here when its cited article presents it as a paradox, a hypothesis about the ultimate fate or a speculation about other universes. Members are placed here from their own cited Wikipedia articles, each with a verbatim supporting quotation, so a reader can check why an entry sits in this group. The grouping forms part of the browse path for this section of the atlas.
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Cosmic Paradoxes and the Fate of the Universe
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Olbers' paradox (Wikipedia)
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Olbers' paradox, also known as the dark night paradox or Olbers and Cheseaux's paradox, is a historical argument in astrophysics and physical cosmology that says the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe.
Heat death of the universe (Wikipedia)
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The heat death of the universe (also known as the Big Chill or the Big Freeze) is a scientific hypothesis regarding the ultimate fate of the universe which posits the universe will evolve to a state of no thermodynamic free energy and, having reached maximum entropy, will therefore be unable to sustain any further thermodynamic processes.
Multiverse (Wikipedia)
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The multiverse is the hypothetical set of all universes.
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