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href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_sl.wikipedia.org&uselang=sl" class=""><span>Denarni prispevki</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Posebno:Registracija&returnto=Svetlobno+leto&returntoquery=action%3Dedit" title="Predlagamo vam, da si ustvarite račun in se prijavite, vendar to ni obvezno." class=""><span>Ustvari račun</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Posebno:Prijava&returnto=Svetlobno+leto&returntoquery=action%3Dedit" title="Prijava je zaželena, vendar ni obvezna [o]" accesskey="o" class=""><span>Prijava</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu 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mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Strani za neprijavljene urejevalce <a href="/wiki/Pomo%C4%8D:Uvod" aria-label="Več o urejanju"><span>več o tem</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Posebno:MojiPrispevki" title="Seznam urejanj s tega IP-naslova [y]" accesskey="y"><span>Prispevki</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Posebno:MojPogovor" title="Pogovor o urejanjih s tega IP-naslova [n]" accesskey="n"><span>Pogovorna stran</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Projekt"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <h1 id="firstHeading" class="firstHeading mw-first-heading">Ogled vira Svetlobno leto</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ta članek obstaja samo v tem jeziku. Dodajte članke v drugih jezikih." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-0" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">Dodaj jezike</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> <div class="after-portlet after-portlet-lang"><span class="uls-after-portlet-link"></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Imenski prostori"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul 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Lahko tudi pošljete e-pošto v čakalno vrsto <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/Stewards" class="extiw" title="m:Special:MyLanguage/Stewards">upravnikov</a> <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/VRT" class="extiw" title="m:Special:MyLanguage/VRT">VRT</a> na <kbd>stewards@wikimedia.org</kbd>, vključno z vsemi zgornjimi podatki.</div></div><hr /> <p>Vsebino te strani si lahko ogledate in jo kopirate. </p><textarea readonly="" accesskey="," id="wpTextbox1" cols="80" rows="25" style="" class="mw-editfont-monospace" lang="sl" dir="ltr" name="wpTextbox1">[[Slika:1e15m comparison light year month comet 1910a1.png|thumb|right|200px|Zunanja lupina predstavlja 1 svetlobno leto od [[Sonce|Sonca]], leva [[rumena]] črta pa je [[tir]] [[komet]]a [[C/1910 A1]]. Notranja lupina je 1 [[svetlobni mesec]].]] '''Svetlòbno léto''' (oznaka '''sv. l.''', mednarodna pa '''ly''') je [[merska enota|enota]] za [[dolžina|dolžino]] in predstavlja [[razdalja|razdaljo]], ki jo [[svetloba]] premosti v enem [[julijansko leto|julijanskem letu]], v [[prostor]]u brez ovir neskončno daleč od [[gravitacijsko polje|gravitacijskih]] ali [[magnetno polje|magnetnih polj]]. Če upoštevamo, da je [[hitrost svetlobe]] v [[vakuum]]u <math>c</math> = 299.792.458 [[meter|metrov]] na [[sekunda|sekundo]], [[julijanski koledar|julijansko leto]] pa ima 365,25 [[dan|dneva]] po 86.400 sekund, ugotovimo, da je svetlobno leto približno enako 9,46 · 10<sup>15</sup> m (natančno [[1 E15 m|9.460.730.472.580.800 metrov]]), oziroma 9,46 [[petameter|petametra]]. '''Svetlobna leta''' se zaradi velike razdalje, ki jo nakazujejo, pogosto uporabljajo za označevanje razdalj v [[Vesolje|Vesolju]]. Svetlobno leto ni enota za [[čas]]. Druga načina označitve velikih razdalj sta še [[astronomska enota]] (''1 a.e. = 1/63.241 sv. l.'') in [[parsek]] (''1 pc = 3,26 sv. l.''). V [[astronomija|astronomiji]] večkrat uporabljajo enoto parsek, ker je lažje računati z njo in z opazovalnimi podatki. Pri tem ni pretvorbenih členov, katerih vrednosti včasih niso natančno znane. Manjše enote so '''svetlobna ura''', '''svetlobna minuta''' in '''svetlobna sekunda'''. Svetlobna ura je enaka 1.079.252.848.800 m, svetlobna minuta 17.987.547.480 m, svetlobna sekunda pa, kot že vemo, 299.792.458 m. == Zgledi == * Svetloba potrebuje približno 499 sekund oziroma 8,32 [[minuta|minute]], da pripotuje od [[Sonce|Sonca]] do [[Zemlja|Zemlje]] (torej smo od Sonca oddaljeni 8,32 svetlobne minute). * Januarja 2004 je bil najbolj oddaljen [[človek|človeški]] predmet, [[vesoljska sonda]] [[Voyager 1]], 12,5 svetlobne [[ura|ure]] oddaljen od Zemlje. * Nam najbližja znana [[zvezda]], [[Proksima Kentavra]], je oddaljena 4,22 svetlobnega leta. * Naša [[Rimska cesta (galaksija)|Galaksija]], je široka približno 100.000 svetlobnih let. * Najbližja [[galaksija]], [[Andromedina galaksija]], je oddaljena 2.360.000 svetlobnih let. * Vidno [[Vesolje]] ima premer približno 13.700.000.000 svetlobnih let. Razlog za to je, da se je [[prapok|veliki pok]] zgodil pred okoli 13,7 milijarde let, pred ta čas pa človeško oko ne vidi. Premer se povečuje v vse smeri za približno eno svetlobno sekundo vsako sekundo. Namišljena [[vesoljsko plovilo|vesoljska ladja]], ki bi potovala skoraj s hitrostjo svetlobe, bi potrebovala okoli 100.000 let za prečkanje naše Galaksije. To velja za opazovalca, ki glede na Galaksijo miruje. Posadki v vesoljski ladji bo zaradi [[podaljšanje časa|podaljšanja časa]], ki nastopa v [[posebna teorija relativnosti|posebni teoriji relativnosti]], minilo nekaj minut. Po drugi strani se bodo posadki dolžine skrčile in se jim bo Galaksija zdela močno sploščena. {{portal|Astronomija}} [[Kategorija:Astronomske konstante]] [[Kategorija:Enote za dolžino]] [[Kategorija:Svetloba]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p>Predloge, uporabljene na tej strani: </p></div><ul> <li><a href="/wiki/Predloga:Portal" title="Predloga:Portal">Predloga:Portal</a> (<a href="/w/index.php?title=Predloga:Portal&action=edit" title="Predloga:Portal">uredi</a>) </li><li><a href="/wiki/Modul:Arguments" title="Modul:Arguments">Modul:Arguments</a> (<a href="/w/index.php?title=Modul:Arguments&action=edit" title="Modul:Arguments">uredi</a>) </li><li><a href="/wiki/Modul:Portal" title="Modul:Portal">Modul:Portal</a> (<a href="/w/index.php?title=Modul:Portal&action=edit" title="Modul:Portal">uredi</a>) </li><li><a href="/wiki/Modul:Portal/images/a" title="Modul:Portal/images/a">Modul:Portal/images/a</a> (<a href="/w/index.php?title=Modul:Portal/images/a&action=edit" title="Modul:Portal/images/a">uredi</a>) </li><li><a href="/wiki/Modul:Portal/styles.css" title="Modul:Portal/styles.css">Modul:Portal/styles.css</a> (<a href="/w/index.php?title=Modul:Portal/styles.css&action=edit" title="Modul:Portal/styles.css">uredi</a>) </li><li><a href="/wiki/Modul:Yesno" title="Modul:Yesno">Modul:Yesno</a> (<a href="/w/index.php?title=Modul:Yesno&action=edit" title="Modul:Yesno">uredi</a>) </li></ul></div><p id="mw-returnto">Vrnitev na <a href="/wiki/Svetlobno_leto" title="Svetlobno leto">Svetlobno leto</a>.</p> <noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Pridobljeno iz »<a dir="ltr" href="https://sl.wikipedia.org/wiki/Svetlobno_leto">https://sl.wikipedia.org/wiki/Svetlobno_leto</a>«</div></div> <div id="catlinks" class="catlinks catlinks-allhidden" data-mw="interface"></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Pravilnik o zasebnosti</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedija:O_Wikipediji">O Wikipediji</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedija:Splo%C5%A1na_zavrnitev_odgovornosti">Zavrnitve odgovornosti</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Kodeks ravnanja</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Razvijalci</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/sl.wikipedia.org">Statistika</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">O piškotkih</a></li> <li id="footer-places-mobileview"><a href="//sl.m.wikipedia.org/w/index.php?title=Svetlobno_leto&action=edit&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Mobilni prikaz</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-f69cdc8f6-g2ggh","wgBackendResponseTime":168,"wgPageParseReport":{"limitreport":{"cputime":"0.004","walltime":"0.005","ppvisitednodes":{"value":17,"limit":1000000},"postexpandincludesize":{"value":773,"limit":2097152},"templateargumentsize":{"value":0,"limit":2097152},"expansiondepth":{"value":2,"limit":100},"expensivefunctioncount":{"value":0,"limit":500},"unstrip-depth":{"value":0,"limit":20},"unstrip-size":{"value":0,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 0.000 1 -total"]},"cachereport":{"origin":"mw-web.codfw.main-f69cdc8f6-g2ggh","timestamp":"20241124162630","ttl":2592000,"transientcontent":false}}});});</script> </body> </html>