Svemir – razlika između verzija
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{{Infobox
|bodystyle = width:25em;
|title = Svemir
|image = [[File:Ilc 9yr moll4096.png|300px]]
|caption = [[Vilkinsonova mikrotalasna anizotropna sonda|WMAP]] slika [[kosmička pozadinska radijacija|kosmičke pozadinske radijacije]]
|label1 = Staros
|data1 = 13,798 ± 0,037 milijardi godina<ref name="planck_cosmological_parameters">{{cite journal |arxiv=1303.5076 |title=Planck 2013 results. XVI. Cosmological parameters |author=Planck collaboration |journal=Astronomy & Astrophysics |date=2014 |bibcode=2014A&A...571A..16P |doi=10.1051/0004-6361/201321591}}</ref><ref name="Planck_perfectuniverse">{{cite web |title=Planck reveals an almost perfect universe |url=http://www.esa.int/Our_Activities/Space_Science/Planck/Planck_reveals_an_almost_perfect_Universe |work=Planck |publisher=[[ESA]] |date=2013-03-21 |accessdate=2013-03-21}}</ref>
|label2 = Prečnik
|data2 = Verovatno beskonačan; 91 milijardi svetlosnih godina (28×10<sup>9</sup> pc)<ref name=Extra-Dimensions>
{{cite book
|author1=Itzhak Bars
|author2=John Terning
|date=2009
|title=Extra Dimensions in Space and Time
|url=http://books.google.com/books?id=fFSMatekilIC&pg=PA27
|pages=27ff
|publisher=Springer
|isbn=978-0-387-77637-8
|accessdate=2011-05-01
}}</ref>
|label4 = Masa (obična materija)
|data4 = Najmanje 10<sup>53</sup> kg<ref name="Paul Davies 2006 43">
{{cite book
|author=Paul Davies
|date=2006
|title=The Goldilocks Enigma
|url=http://www.amazon.com/Goldilocks-Enigma-Universe-Just-Right/dp/0547053584/ref=sr_1_1?s=books&ie=UTF8&qid=1372701918&sr=1-1&keywords=goldilocks+enigma
|page=43ff
|publisher=First Mariner Books
|isbn=978-0-618-59226-5
|accessdate=2013-07-01
}}</ref>
|label5 = Prosečna gustina
|data5 = 4.5 x 10<sup>−31</sup> g/cm<sup>3</sup><ref name="wmap_universe_made_of">
{{cite web
|author=NASA/WMAP Science Team
|date=24 January 2014
|title=Universe 101: What is the Universe Made Of?
|url=http://map.gsfc.nasa.gov/universe/uni_matter.html
|publisher=NASA
|accessdate=2015-02-17
}}</ref>
|label6 = Prosečna temperatura
|data6 = 2,72548 K<ref>
{{Cite journal
|last1 = Fixsen |first1=D. J.
|date = 2009
|title = The Temperature of the Cosmic Microwave Background
|journal = The Astrophysical Journal
|volume = 707 |issue=2 |pages=916–920
|arxiv = 0911.1955
|bibcode = 2009ApJ...707..916F
|doi = 10.1088/0004-637X/707/2/916
}}</ref>
|label8 = Sastojci
|data8 = [[Materija|Obična (barionska) materija]] (4,9%), [[tamna materija]] (26.8%), [[tamna energija]] (68.3%)<ref name="DarkMatter">Sean Carroll, Ph.D., Cal Tech, 2007, The Teaching Company, ''Dark Matter, Dark Energy: The Dark Side of the Universe'', Guidebook Part 1 pages 1 and 3, Accessed Oct. 7, 2013, "...only 5% of the Universe is made of ordinary matter, with 25 percent being some kind of unseen dark matter and a full 70% being a smoothly distributed dark energy..."</ref>
|label9 = Oblik
|data9 = Ravan sa samo 0,4% marginom greške<ref>
{{cite web
|author=NASA/WMAP Science Team
|date=24 January 2014
|url=http://map.gsfc.nasa.gov/universe/uni_shape.html
|title=Universe 101: Will the Universe expand forever?
|publisher=NASA
|accessdate=16 April 2015
}}</ref>
}}
[[Datoteka:Universum.jpg|thumb|250px|[[Flammarionov drvorez]], Pariz 1888., u boji]]
[[Datoteka:Hubble Extreme Deep Field (full resolution).png|250px|mini|desno|Najdublja slika svemira u vidljivom delu spektra.]]
'''Svemir''', '''kosmos''', '''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 vremenski prostor u kome plovi mnoštvo nebeskih tijela i koji postoji neovisno od ljudskog znanja. Nebeska tijela dijelimo na:
{{Columns-list|4|
* [[zvijezda|zvijezde]]
Linija 14 ⟶ 81:
* [[neutronska zvijezda|neutronske zvijezde]]
}}
Najveći deo materije i energije je najverovatnije u obliku [[tamna materija|tamne materije]] i [[tamna energija|tamne energije]].<ref>{{cite book |url=http://www.yourdictionary.com/Universe |title=The American Heritage Dictionary of the English Language |edition=4th |date=2010 |publisher=Houghton Mifflin Harcourt Publishing Company}}</ref><ref>{{cite book |url=http://dictionary.cambridge.org/dictionary/british/universe?q=universe |title=Cambridge Advanced Learner's Dictionary}}</ref>
Zvijezde su najrasprostranjenija nebeska tijela u Svemiru. To su užarena plinovita tijela slična [[Sunce|Suncu]] ([http://voyager.jpl.nasa.gov/multimedia/images/sun.jpg sl.1]). Golim okom možemo vidjeti oko 5000 zvijezda a teleskopom stotine milijardi. Udaljenosti među zvijezdama su ogromne i mjere se svjetlosnim godinama (SG). Svjetlosna godina je put dug oko 9,46 biliona kilometara što ga pređe svjetlost za godinu krećući se brzinom od 299 792 458 m/s.Sunce je [[Zemlja|Zemlji]] ([http://www.astro.washington.edu/weblinks/Earth/earth.gif sl.2]) najbliža zvijezda koja se nalazi na udaljenosti od 149 600 000 km ili 8,3 svjetlosne sekunde (sm). Osim Sunca, najbliža je [[Proksima Kentaura]] (Proxima Centauri ili Alpha Centauri C, [http://www.ipac.caltech.edu/2mass/gallery/proxima_cen.jpg sl.3]) koja je udaljena oko 4,3 SG. Zvijezde se međusobno razlikuju po veličini, boji i sjaju. Najsjajnija zvijezda u [[sazviježđe|sazviježđu]] Orion je [[Betelgez]] (Betelgeuze ili Alpha Orionis, [http://antwrp.gsfc.nasa.gov/apod/ap990605.html sl.4]),a [[Antares]] (Alpha Scorpii, [http://hw.sakura.ne.jp/~yumi/space/star/k_image/st-ant.jpg sl.5]) u sazviježđu §korpion.
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