[[Datoteka:Hubble Extreme Deep Field (full resolution).png|250px|mini|desno|Najdublja slika svemira u vidljivom delu spektra.]]
'''Svemir''', '''kosmos''', kurac'''vasiona''' ili '''univerzum''' je beskonačno prostranstvo koje nas okružuje.<ref>{{cite book |url=http://www.yourdictionary.com/Universe |title=Universe |work=Webster's New World College Dictionary, Wiley Publishing, Inc. |date=2010}}</ref><ref>{{cite web |url=http://dictionary.reference.com/browse/Universe?s=t |title=Universe |work=Dictionary.com |accessdate=2012-09-21}}<!-- this source even includes supposed things, not JUST known things--></ref><ref>{{cite web |url=http://www.merriam-webster.com/dictionary/Universe |title=Universe |work=Merriam-Webster Dictionary |accessdate=2012-09-21}}<!-- this source even includes postulated things, not JUST known things--></ref><ref>{{cite book |title=Introductory Astronomy & Astrophysics |last1=Zeilik |first1=Michael |last2=Gregory |first2=Stephen A. |date=1998 |edition=4th |publisher=Saunders College Publishing |quote="The totality of all space and time; all that is, has been, and will be." |isbn=0030062284}}</ref> To je ustvari praznina ispunjena materijom koju običnim posmatranjem doživljavamo kao nebeska tela i koji postoji neovisno od ljudskog znanja. Nebeska tijela dijelimo na:
