Universet: Forskelle mellem versioner

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[[Fil:CMB Timeline75.jpg|thumb|En tidslinie for universets udvidelse.]]
'''Universet''' (også '''verdensalt''') defineres almindeligvis som alt eksisterende,<ref>{{cite book|url=http://www.yourdictionary.com/Universe|title=Universe|work=Webster's New World College Dictionary, Wiley Publishing, Inc.|year=2010}}
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{{Cite web |url=http://www.britannica.com/search?query=Universe |work=Encyclopedia Britannica |title=Universe |quote=the whole cosmic system of matter and energy of which Earth, and therefore the human race, is a part }}
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{{cite book |url=http://dictionary.cambridge.org/dictionary/british/universe?q=universe|title=Cambridge Advanced Learner's Dictionary}}
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Lignende termer omfatter [[kosmos]], [[verdensalt]] og [[verden]].
 
Universet formodes at være begyndt for cirka 13,7 milliarder år siden. ''[[Big Bang|Big bang]]''-teorien siger at universet hele tiden udvider sig, og at denne udvidelse startede fra en [[Gravitationel singularitet|singularitet]] ("alt" var samlet i ét punkt).