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{{universo}}
'''Cosmic variance''' is the [[Statistics|statistical]] [[uncertainty]] inherent in observations of the universe at extreme distances. It is based on the idea that it is only possible to observe part of the universe at one particular time, so it is difficult to make statistical statements about [[physical cosmology|cosmology]] on the scale of the entire universe,<ref name="aspj">{{Cite journal | url=http://www.iop.org/EJ/article/1538-4357/600/2/L171/17416.html | author=Somerville ''et al.'' | title=Cosmic Variance in the Great Observatories Origins Deep Survey | journal=The [[Astrophysical Journal]] Letters | year=2004 | volume=600 | issue=2 | pages=L171–L174 | doi=10.1086/378628 | last2=Lee | first2=Kyoungsoo | last3=Ferguson | first3=Henry C. | last4=Gardner | first4=Jonathan P. | last5=Moustakas | first5=Leonidas A. | last6=Giavalisco | first6=Mauro}}</ref><ref name="aas">{{Cite web|url=http://www.aas.org/publications/baas/v37n4/aas207/1366.htm|title=Quantifying the Effects of Cosmic Variance Using the NOAO Deep-Wide Field Survey|accessdate=September 18, 2007|publisher=American Astronomical Society|year=2006|author=M.S. Keremedjiev (Cornell University)|work=37 #4}}</ref> as the number of observations ([[sample size]]) may be too small.▼
La '''varianza cosmica''' è l'[[incertezza]] [[statistica]] inerente le osservazioni dell'[[universo]] a distanze estreme. Essa si basa sull'idea che è possibile osservare solo una parte dell'universo in un determinato istante, quindi è difficile fare rilevazioni statistiche sulla cosmologia sulla scala dell'intero universo<ref name="aspj">{{cita pubblicazione
| quotes =
| autore =Somerville
| coautori = et al.
| data =
| anno = 2004
| mese =
| titolo = Cosmic Variance in the Great Observatories Origins Deep Survey
| rivista = The [[Astrophysical Journal]] Letters
| volume = 600
| numero = 2
| pagine = L171–L174
| doi = 10.1086/378628
| id =
| url = http://www.iop.org/EJ/article/1538-4357/600/2/L171/17416.html
| lingua =
| accesso =
| abstract =
| cid =
}}</ref>
, [1] [2] il numero di osservazioni (dimensione del campione), può essere troppo piccolo.
▲'''Cosmic variance''' is the [[Statistics|statistical]] [[uncertainty]] inherent in observations of the universe at extreme distances. It is based on the idea that it is only possible to observe part of the universe at one particular time, so it is difficult to make statistical statements about [[physical cosmology|cosmology]] on the scale of the entire universe,<ref name="aspj">{{Cite journal | url=http://www.iop.org/EJ/article/1538-4357/600/2/L171/17416.html | author=Somerville ''et al.'' | title=Cosmic Variance in the Great Observatories Origins Deep Survey | journal=The [[Astrophysical Journal]] Letters | year=2004 | volume=600 | issue=2 | pages=L171–L174 | doi=10.1086/378628 | last2=Lee | first2=Kyoungsoo | last3=Ferguson | first3=Henry C. | last4=Gardner | first4=Jonathan P. | last5=Moustakas | first5=Leonidas A. | last6=Giavalisco | first6=Mauro}}</ref>
<ref name="aas">{{Cite web|url=http://www.aas.org/publications/baas/v37n4/aas207/1366.htm|title=Quantifying the Effects of Cosmic Variance Using the NOAO Deep-Wide Field Survey|accessdate=September 18, 2007|publisher=American Astronomical Society|year=2006|author=M.S. Keremedjiev (Cornell University)|work=37 #4}}</ref> as the number of observations ([[sample size]]) may be too small.
== Background ==
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