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Tilgængelig på 131 sprog" > <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-131" 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">131 sprog</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Ligsnelheid" title="Ligsnelheid – afrikaans" lang="af" hreflang="af" data-title="Ligsnelheid" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/Lichtgeschwindigkeit" title="Lichtgeschwindigkeit – schweizertysk" lang="gsw" hreflang="gsw" data-title="Lichtgeschwindigkeit" data-language-autonym="Alemannisch" data-language-local-name="schweizertysk" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%8B%A8%E1%89%A5%E1%88%AD%E1%88%83%E1%8A%95_%E1%8D%8D%E1%8C%A5%E1%8A%90%E1%89%B5" title="የብርሃን ፍጥነት – amharisk" lang="am" hreflang="am" data-title="የብርሃን ፍጥነት" data-language-autonym="አማርኛ" data-language-local-name="amharisk" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Velocidat_d%27a_luz" title="Velocidat d'a luz – aragonsk" lang="an" hreflang="an" data-title="Velocidat d'a luz" data-language-autonym="Aragonés" data-language-local-name="aragonsk" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B3%D8%B1%D8%B9%D8%A9_%D8%A7%D9%84%D8%B6%D9%88%D8%A1" title="سرعة الضوء – arabisk" lang="ar" hreflang="ar" data-title="سرعة الضوء" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D8%B3%D8%B1%D8%B9%D8%A9_%D8%A7%D9%84%D9%86%D9%88%D8%B1" title="سرعة النور – Egyptian Arabic" lang="arz" hreflang="arz" data-title="سرعة النور" data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%AA%E0%A7%8B%E0%A6%B9%E0%A7%B0%E0%A7%B0_%E0%A6%AC%E0%A7%87%E0%A6%97" title="পোহৰৰ বেগ – assamesisk" lang="as" hreflang="as" data-title="পোহৰৰ বেগ" data-language-autonym="অসমীয়া" data-language-local-name="assamesisk" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Velocid%C3%A1_de_la_lluz" title="Velocidá de la lluz – asturisk" lang="ast" hreflang="ast" data-title="Velocidá de la lluz" data-language-autonym="Asturianu" data-language-local-name="asturisk" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/%C4%B0%C5%9F%C4%B1q_s%C3%BCr%C9%99ti" title="İşıq sürəti – aserbajdsjansk" lang="az" hreflang="az" data-title="İşıq sürəti" data-language-autonym="Azərbaycanca" data-language-local-name="aserbajdsjansk" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%AF%D2%A1%D1%82%D1%8B%D0%BB%D1%8B%D2%A1_%D1%82%D0%B8%D2%99%D0%BB%D0%B5%D0%B3%D0%B5" title="Яҡтылыҡ тиҙлеге – bashkir" lang="ba" hreflang="ba" data-title="Яҡтылыҡ тиҙлеге" data-language-autonym="Башҡортса" data-language-local-name="bashkir" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-bat-smg mw-list-item"><a href="https://bat-smg.wikipedia.org/wiki/%C5%A0v%C4%97isas_veikis" title="Švėisas veikis – Samogitian" lang="sgs" hreflang="sgs" data-title="Švėisas veikis" data-language-autonym="Žemaitėška" data-language-local-name="Samogitian" class="interlanguage-link-target"><span>Žemaitėška</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Rikas_nin_liwanag" title="Rikas nin liwanag – Central Bikol" lang="bcl" hreflang="bcl" data-title="Rikas nin liwanag" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A1%D0%BA%D0%BE%D1%80%D0%B0%D1%81%D1%86%D1%8C_%D1%81%D0%B2%D1%8F%D1%82%D0%BB%D0%B0" title="Скорасць святла – belarusisk" lang="be" hreflang="be" data-title="Скорасць святла" data-language-autonym="Беларуская" data-language-local-name="belarusisk" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A5%D1%83%D1%82%D0%BA%D0%B0%D1%81%D1%8C%D1%86%D1%8C_%D1%81%D1%8C%D0%B2%D1%8F%D1%82%D0%BB%D0%B0" title="Хуткасьць сьвятла – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Хуткасьць сьвятла" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A1%D0%BA%D0%BE%D1%80%D0%BE%D1%81%D1%82_%D0%BD%D0%B0_%D1%81%D0%B2%D0%B5%D1%82%D0%BB%D0%B8%D0%BD%D0%B0%D1%82%D0%B0" title="Скорост на светлината – bulgarsk" lang="bg" hreflang="bg" data-title="Скорост на светлината" data-language-autonym="Български" data-language-local-name="bulgarsk" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%85%E0%A4%81%E0%A4%9C%E0%A5%8B%E0%A4%B0%E0%A4%BF%E0%A4%AF%E0%A4%BE_%E0%A4%95%E0%A5%87_%E0%A4%97%E0%A4%A4%E0%A4%BF%E0%A4%B5%E0%A5%87%E0%A4%97" title="अँजोरिया के गतिवेग – Bhojpuri" lang="bh" hreflang="bh" data-title="अँजोरिया के गतिवेग" data-language-autonym="भोजपुरी" data-language-local-name="Bhojpuri" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%86%E0%A6%B2%E0%A7%8B%E0%A6%B0_%E0%A6%A6%E0%A7%8D%E0%A6%B0%E0%A7%81%E0%A6%A4%E0%A6%BF" title="আলোর দ্রুতি – bengali" lang="bn" hreflang="bn" data-title="আলোর দ্রুতি" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Tizh_ar_goulo%C3%B9" title="Tizh ar gouloù – bretonsk" lang="br" hreflang="br" data-title="Tizh ar gouloù" data-language-autonym="Brezhoneg" data-language-local-name="bretonsk" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Brzina_svjetlosti" title="Brzina svjetlosti – bosnisk" lang="bs" hreflang="bs" data-title="Brzina svjetlosti" data-language-autonym="Bosanski" data-language-local-name="bosnisk" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-bxr mw-list-item"><a href="https://bxr.wikipedia.org/wiki/%D0%93%D1%8D%D1%80%D1%8D%D0%BB%D1%8D%D0%B9_%D1%85%D1%83%D1%80%D0%B4%D0%B0%D0%BD" title="Гэрэлэй хурдан – Russia Buriat" lang="bxr" hreflang="bxr" data-title="Гэрэлэй хурдан" data-language-autonym="Буряад" data-language-local-name="Russia Buriat" class="interlanguage-link-target"><span>Буряад</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Velocitat_de_la_llum" title="Velocitat de la llum – catalansk" lang="ca" hreflang="ca" data-title="Velocitat de la llum" data-language-autonym="Català" data-language-local-name="catalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/Gu%C5%8Fng-s%C3%B3k" title="Guŏng-sók – Mindong" lang="cdo" hreflang="cdo" data-title="Guŏng-sók" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%AE%DB%8E%D8%B1%D8%A7%DB%8C%DB%8C%DB%8C_%DA%95%D9%88%D9%88%D9%86%D8%A7%DA%A9%DB%8C" title="خێراییی ڕووناکی – sorani" lang="ckb" hreflang="ckb" data-title="خێراییی ڕووناکی" data-language-autonym="کوردی" data-language-local-name="sorani" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Rychlost_sv%C4%9Btla" title="Rychlost světla – tjekkisk" lang="cs" hreflang="cs" data-title="Rychlost světla" data-language-autonym="Čeština" data-language-local-name="tjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%C3%87%D1%83%D1%82%C4%83_%D1%85%C4%83%D0%B2%C4%83%D1%80%D1%82%D0%BB%C4%83%D1%85%C4%95" title="Çутă хăвăртлăхĕ – tjuvasjisk" lang="cv" hreflang="cv" data-title="Çутă хăвăртлăхĕ" data-language-autonym="Чӑвашла" data-language-local-name="tjuvasjisk" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Cyflymder_golau" title="Cyflymder golau – walisisk" lang="cy" hreflang="cy" data-title="Cyflymder golau" data-language-autonym="Cymraeg" data-language-local-name="walisisk" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-de badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://de.wikipedia.org/wiki/Lichtgeschwindigkeit" title="Lichtgeschwindigkeit – tysk" lang="de" hreflang="de" data-title="Lichtgeschwindigkeit" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A4%CE%B1%CF%87%CF%8D%CF%84%CE%B7%CF%84%CE%B1_%CF%84%CE%BF%CF%85_%CF%86%CF%89%CF%84%CF%8C%CF%82" title="Ταχύτητα του φωτός – græsk" lang="el" hreflang="el" data-title="Ταχύτητα του φωτός" data-language-autonym="Ελληνικά" data-language-local-name="græsk" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://en.wikipedia.org/wiki/Speed_of_light" title="Speed of light – engelsk" lang="en" hreflang="en" data-title="Speed of light" data-language-autonym="English" data-language-local-name="engelsk" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Lumrapido" title="Lumrapido – esperanto" lang="eo" hreflang="eo" data-title="Lumrapido" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Velocidad_de_la_luz" title="Velocidad de la luz – spansk" lang="es" hreflang="es" data-title="Velocidad de la luz" data-language-autonym="Español" data-language-local-name="spansk" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Valguse_kiirus" title="Valguse kiirus – estisk" lang="et" hreflang="et" data-title="Valguse kiirus" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Argiaren_abiadura" title="Argiaren abiadura – baskisk" lang="eu" hreflang="eu" data-title="Argiaren abiadura" data-language-autonym="Euskara" data-language-local-name="baskisk" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-ext mw-list-item"><a href="https://ext.wikipedia.org/wiki/Veloci%C3%A1_de_la_lus" title="Velociá de la lus – Extremaduran" lang="ext" hreflang="ext" data-title="Velociá de la lus" data-language-autonym="Estremeñu" data-language-local-name="Extremaduran" class="interlanguage-link-target"><span>Estremeñu</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%D8%B1%D8%B9%D8%AA_%D9%86%D9%88%D8%B1" title="سرعت نور – persisk" lang="fa" hreflang="fa" data-title="سرعت نور" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Valonnopeus" title="Valonnopeus – finsk" lang="fi" hreflang="fi" data-title="Valonnopeus" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fj mw-list-item"><a href="https://fj.wikipedia.org/wiki/Totolo_ni_rarama" title="Totolo ni rarama – fijiansk" lang="fj" hreflang="fj" data-title="Totolo ni rarama" data-language-autonym="Na Vosa Vakaviti" data-language-local-name="fijiansk" class="interlanguage-link-target"><span>Na Vosa Vakaviti</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Vitesse_de_la_lumi%C3%A8re" title="Vitesse de la lumière – fransk" lang="fr" hreflang="fr" data-title="Vitesse de la lumière" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Faard_faan%27t_laacht" title="Faard faan't laacht – nordfrisisk" lang="frr" hreflang="frr" data-title="Faard faan't laacht" data-language-autonym="Nordfriisk" data-language-local-name="nordfrisisk" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-fur mw-list-item"><a href="https://fur.wikipedia.org/wiki/Velocit%C3%A2t_de_l%C3%BBs" title="Velocitât de lûs – friulisk" lang="fur" hreflang="fur" data-title="Velocitât de lûs" data-language-autonym="Furlan" data-language-local-name="friulisk" class="interlanguage-link-target"><span>Furlan</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Ljochtfaasje" title="Ljochtfaasje – vestfrisisk" lang="fy" hreflang="fy" data-title="Ljochtfaasje" data-language-autonym="Frysk" data-language-local-name="vestfrisisk" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Luas_an_tsolais" title="Luas an tsolais – irsk" lang="ga" hreflang="ga" data-title="Luas an tsolais" data-language-autonym="Gaeilge" data-language-local-name="irsk" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gcr mw-list-item"><a href="https://gcr.wikipedia.org/wiki/Vit%C3%A8s_di_limy%C3%A8" title="Vitès di limyè – Guianan Creole" lang="gcr" hreflang="gcr" data-title="Vitès di limyè" data-language-autonym="Kriyòl gwiyannen" data-language-local-name="Guianan Creole" class="interlanguage-link-target"><span>Kriyòl gwiyannen</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Velocidade_da_luz" title="Velocidade da luz – galicisk" lang="gl" hreflang="gl" data-title="Velocidade da luz" data-language-autonym="Galego" data-language-local-name="galicisk" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gn mw-list-item"><a href="https://gn.wikipedia.org/wiki/Tesape_pya%27ekue" title="Tesape pya'ekue – guarani" lang="gn" hreflang="gn" data-title="Tesape pya'ekue" data-language-autonym="Avañe'ẽ" data-language-local-name="guarani" class="interlanguage-link-target"><span>Avañe'ẽ</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%AA%E0%AB%8D%E0%AA%B0%E0%AA%95%E0%AA%BE%E0%AA%B6%E0%AA%A8%E0%AB%8B_%E0%AA%B5%E0%AB%87%E0%AA%97" title="પ્રકાશનો વેગ – gujarati" lang="gu" hreflang="gu" data-title="પ્રકાશનો વેગ" data-language-autonym="ગુજરાતી" data-language-local-name="gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%94%D7%99%D7%A8%D7%95%D7%AA_%D7%94%D7%90%D7%95%D7%A8" title="מהירות האור – hebraisk" lang="he" hreflang="he" data-title="מהירות האור" data-language-autonym="עברית" data-language-local-name="hebraisk" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%BE%E0%A4%B6_%E0%A4%95%E0%A4%BE_%E0%A4%B5%E0%A5%87%E0%A4%97" title="प्रकाश का वेग – hindi" lang="hi" hreflang="hi" data-title="प्रकाश का वेग" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hif mw-list-item"><a href="https://hif.wikipedia.org/wiki/Parkaas_ke_raftaar" title="Parkaas ke raftaar – Fiji Hindi" lang="hif" hreflang="hif" data-title="Parkaas ke raftaar" data-language-autonym="Fiji Hindi" data-language-local-name="Fiji Hindi" class="interlanguage-link-target"><span>Fiji Hindi</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Brzina_svjetlosti" title="Brzina svjetlosti – kroatisk" lang="hr" hreflang="hr" data-title="Brzina svjetlosti" data-language-autonym="Hrvatski" data-language-local-name="kroatisk" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Vit%C3%A8s_limy%C3%A8" title="Vitès limyè – haitisk" lang="ht" hreflang="ht" data-title="Vitès limyè" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haitisk" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/F%C3%A9nysebess%C3%A9g" title="Fénysebesség – ungarsk" lang="hu" hreflang="hu" data-title="Fénysebesség" data-language-autonym="Magyar" data-language-local-name="ungarsk" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BC%D5%B8%D6%82%D5%B5%D5%BD%D5%AB_%D5%A1%D6%80%D5%A1%D5%A3%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Լույսի արագություն – armensk" lang="hy" hreflang="hy" data-title="Լույսի արագություն" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Velocitate_de_lumine" title="Velocitate de lumine – interlingua" lang="ia" hreflang="ia" data-title="Velocitate de lumine" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Laju_cahaya" title="Laju cahaya – indonesisk" lang="id" hreflang="id" data-title="Laju cahaya" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Lj%C3%B3shra%C3%B0i" title="Ljóshraði – islandsk" lang="is" hreflang="is" data-title="Ljóshraði" data-language-autonym="Íslenska" data-language-local-name="islandsk" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Velocit%C3%A0_della_luce" title="Velocità della luce – italiensk" lang="it" hreflang="it" data-title="Velocità della luce" data-language-autonym="Italiano" data-language-local-name="italiensk" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%85%89%E9%80%9F" title="光速 – japansk" lang="ja" hreflang="ja" data-title="光速" data-language-autonym="日本語" data-language-local-name="japansk" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-jam mw-list-item"><a href="https://jam.wikipedia.org/wiki/Spiid_a_lait" title="Spiid a lait – Jamaican Creole English" lang="jam" hreflang="jam" data-title="Spiid a lait" data-language-autonym="Patois" data-language-local-name="Jamaican Creole English" class="interlanguage-link-target"><span>Patois</span></a></li><li class="interlanguage-link interwiki-jbo mw-list-item"><a href="https://jbo.wikipedia.org/wiki/nilsutra_lo_gusni" title="nilsutra lo gusni – lojban" lang="jbo" hreflang="jbo" data-title="nilsutra lo gusni" data-language-autonym="La .lojban." data-language-local-name="lojban" class="interlanguage-link-target"><span>La .lojban.</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%A1%E1%83%98%E1%83%9C%E1%83%90%E1%83%97%E1%83%9A%E1%83%98%E1%83%A1_%E1%83%A1%E1%83%98%E1%83%A9%E1%83%A5%E1%83%90%E1%83%A0%E1%83%94" title="სინათლის სიჩქარე – georgisk" lang="ka" hreflang="ka" data-title="სინათლის სიჩქარე" data-language-autonym="ქართული" data-language-local-name="georgisk" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kcg mw-list-item"><a href="https://kcg.wikipedia.org/wiki/Cung_sai" title="Cung sai – tyap" lang="kcg" hreflang="kcg" data-title="Cung sai" data-language-autonym="Tyap" data-language-local-name="tyap" class="interlanguage-link-target"><span>Tyap</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%96%D0%B0%D1%80%D1%8B%D2%9B_%D0%B6%D1%8B%D0%BB%D0%B4%D0%B0%D0%BC%D0%B4%D1%8B%D2%93%D1%8B" title="Жарық жылдамдығы – kasakhisk" lang="kk" hreflang="kk" data-title="Жарық жылдамдығы" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-km mw-list-item"><a href="https://km.wikipedia.org/wiki/%E1%9E%9B%E1%9F%92%E1%9E%94%E1%9E%BF%E1%9E%93%E1%9E%96%E1%9E%93%E1%9F%92%E1%9E%9B%E1%9E%BA" title="ល្បឿនពន្លឺ – khmer" lang="km" hreflang="km" data-title="ល្បឿនពន្លឺ" data-language-autonym="ភាសាខ្មែរ" data-language-local-name="khmer" class="interlanguage-link-target"><span>ភាសាខ្មែរ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B9%9B%EC%9D%98_%EC%86%8D%EB%A0%A5" title="빛의 속력 – koreansk" lang="ko" hreflang="ko" data-title="빛의 속력" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-kw mw-list-item"><a href="https://kw.wikipedia.org/wiki/Tooth_golow" title="Tooth golow – cornisk" lang="kw" hreflang="kw" data-title="Tooth golow" data-language-autonym="Kernowek" data-language-local-name="cornisk" class="interlanguage-link-target"><span>Kernowek</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%96%D0%B0%D1%80%D1%8B%D0%BA_%D1%8B%D0%BB%D0%B4%D0%B0%D0%BC%D0%B4%D1%8B%D0%B3%D1%8B" title="Жарык ылдамдыгы – kirgisisk" lang="ky" hreflang="ky" data-title="Жарык ылдамдыгы" data-language-autonym="Кыргызча" data-language-local-name="kirgisisk" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Celeritas_lucis" title="Celeritas lucis – latin" lang="la" hreflang="la" data-title="Celeritas lucis" data-language-autonym="Latina" data-language-local-name="latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Liichtvitess" title="Liichtvitess – luxembourgsk" lang="lb" hreflang="lb" data-title="Liichtvitess" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxembourgsk" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lez mw-list-item"><a href="https://lez.wikipedia.org/wiki/%D0%AD%D0%BA%D1%83%D1%8C%D0%BD%D0%B8%D0%BD_%D0%B7%D0%B0%D1%80%D0%B1%D0%B2%D0%B0%D0%BB" title="Экуьнин зарбвал – lezghian" lang="lez" hreflang="lez" data-title="Экуьнин зарбвал" data-language-autonym="Лезги" data-language-local-name="lezghian" class="interlanguage-link-target"><span>Лезги</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Rapidia_de_lus" title="Rapidia de lus – Lingua Franca Nova" lang="lfn" hreflang="lfn" data-title="Rapidia de lus" data-language-autonym="Lingua Franca Nova" data-language-local-name="Lingua Franca Nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Velocit%C3%A0_de_la_lus" title="Velocità de la lus – Lombard" lang="lmo" hreflang="lmo" data-title="Velocità de la lus" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/%C5%A0viesos_greitis" title="Šviesos greitis – litauisk" lang="lt" hreflang="lt" data-title="Šviesos greitis" data-language-autonym="Lietuvių" data-language-local-name="litauisk" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Gaismas_%C4%81trums" title="Gaismas ātrums – lettisk" lang="lv" hreflang="lv" data-title="Gaismas ātrums" data-language-autonym="Latviešu" data-language-local-name="lettisk" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-min mw-list-item"><a href="https://min.wikipedia.org/wiki/Laju_cahayo" title="Laju cahayo – minangkabau" lang="min" hreflang="min" data-title="Laju cahayo" data-language-autonym="Minangkabau" data-language-local-name="minangkabau" class="interlanguage-link-target"><span>Minangkabau</span></a></li><li class="interlanguage-link interwiki-mk badge-Q17437798 badge-goodarticle mw-list-item" title="god artikel"><a href="https://mk.wikipedia.org/wiki/%D0%91%D1%80%D0%B7%D0%B8%D0%BD%D0%B0_%D0%BD%D0%B0_%D1%81%D0%B2%D0%B5%D1%82%D0%BB%D0%B8%D0%BD%D0%B0%D1%82%D0%B0" title="Брзина на светлината – makedonsk" lang="mk" hreflang="mk" data-title="Брзина на светлината" data-language-autonym="Македонски" data-language-local-name="makedonsk" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%AA%E0%B5%8D%E0%B4%B0%E0%B4%95%E0%B4%BE%E0%B4%B6%E0%B4%B5%E0%B5%87%E0%B4%97%E0%B4%82" title="പ്രകാശവേഗം – malayalam" lang="ml" hreflang="ml" data-title="പ്രകാശവേഗം" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%93%D1%8D%D1%80%D0%BB%D0%B8%D0%B9%D0%BD_%D1%85%D1%83%D1%80%D0%B4" title="Гэрлийн хурд – mongolsk" lang="mn" hreflang="mn" data-title="Гэрлийн хурд" data-language-autonym="Монгол" data-language-local-name="mongolsk" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%BE%E0%A4%B6%E0%A4%BE%E0%A4%9A%E0%A4%BE_%E0%A4%B5%E0%A5%87%E0%A4%97" title="प्रकाशाचा वेग – marathisk" lang="mr" hreflang="mr" data-title="प्रकाशाचा वेग" data-language-autonym="मराठी" data-language-local-name="marathisk" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kelajuan_cahaya" title="Kelajuan cahaya – malajisk" lang="ms" hreflang="ms" data-title="Kelajuan cahaya" data-language-autonym="Bahasa Melayu" data-language-local-name="malajisk" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%9C%E1%80%84%E1%80%BA%E1%80%B8%E1%80%A1%E1%80%9C%E1%80%BB%E1%80%84%E1%80%BA" title="အလင်းအလျင် – burmesisk" lang="my" hreflang="my" data-title="အလင်းအလျင်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="burmesisk" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Lichtsnellheid" title="Lichtsnellheid – nedertysk" lang="nds" hreflang="nds" data-title="Lichtsnellheid" data-language-autonym="Plattdüütsch" data-language-local-name="nedertysk" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Lichtsnelheid" title="Lichtsnelheid – nederlandsk" lang="nl" hreflang="nl" data-title="Lichtsnelheid" data-language-autonym="Nederlands" data-language-local-name="nederlandsk" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Ljosfarten" title="Ljosfarten – nynorsk" lang="nn" hreflang="nn" data-title="Ljosfarten" data-language-autonym="Norsk nynorsk" data-language-local-name="nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Lysets_hastighet" title="Lysets hastighet – bokmål" lang="nb" hreflang="nb" data-title="Lysets hastighet" data-language-autonym="Norsk bokmål" data-language-local-name="bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Velocitat_de_la_lutz" title="Velocitat de la lutz – occitansk" lang="oc" hreflang="oc" data-title="Velocitat de la lutz" data-language-autonym="Occitan" data-language-local-name="occitansk" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Saffisa_ifaa" title="Saffisa ifaa – oromo" lang="om" hreflang="om" data-title="Saffisa ifaa" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%B0%E0%A9%8C%E0%A8%B8%E0%A8%BC%E0%A8%A8%E0%A9%80_%E0%A8%A6%E0%A9%80_%E0%A8%97%E0%A8%A4%E0%A9%80" title="ਰੌਸ਼ਨੀ ਦੀ ਗਤੀ – punjabisk" lang="pa" hreflang="pa" data-title="ਰੌਸ਼ਨੀ ਦੀ ਗਤੀ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabisk" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Pr%C4%99dko%C5%9B%C4%87_%C5%9Bwiat%C5%82a" title="Prędkość światła – polsk" lang="pl" hreflang="pl" data-title="Prędkość światła" data-language-autonym="Polski" data-language-local-name="polsk" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%B1%D9%88%D8%B4%D9%86%DB%8C_%D8%AF%DB%8C_%D8%B1%D9%81%D8%AA%D8%A7%D8%B1" title="روشنی دی رفتار – Western Punjabi" lang="pnb" hreflang="pnb" data-title="روشنی دی رفتار" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%D8%AF_%D9%84%D9%85%D8%B1_%D8%B3%D8%B1%D8%B9%D8%AA" title="د لمر سرعت – pashto" lang="ps" hreflang="ps" data-title="د لمر سرعت" data-language-autonym="پښتو" data-language-local-name="pashto" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Velocidade_da_luz" title="Velocidade da luz – portugisisk" lang="pt" hreflang="pt" data-title="Velocidade da luz" data-language-autonym="Português" data-language-local-name="portugisisk" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Viteza_luminii" title="Viteza luminii – rumænsk" lang="ro" hreflang="ro" data-title="Viteza luminii" data-language-autonym="Română" data-language-local-name="rumænsk" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D0%BA%D0%BE%D1%80%D0%BE%D1%81%D1%82%D1%8C_%D1%81%D0%B2%D0%B5%D1%82%D0%B0" title="Скорость света – russisk" lang="ru" hreflang="ru" data-title="Скорость света" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%A8%D0%B2%D1%8B%D0%B4%D0%BA%D0%BE%D1%81%D1%82%D1%8C_%D1%81%D0%B2%D1%96%D1%82%D0%BB%D0%B0" title="Швыдкость світла – Rusyn" lang="rue" hreflang="rue" data-title="Швыдкость світла" data-language-autonym="Русиньскый" data-language-local-name="Rusyn" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Vilucitati_d%C3%A2_luci" title="Vilucitati dâ luci – siciliansk" lang="scn" hreflang="scn" data-title="Vilucitati dâ luci" data-language-autonym="Sicilianu" data-language-local-name="siciliansk" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Speed_o_licht" title="Speed o licht – skotsk" lang="sco" hreflang="sco" data-title="Speed o licht" data-language-autonym="Scots" data-language-local-name="skotsk" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Brzina_svjetlosti" title="Brzina svjetlosti – serbokroatisk" lang="sh" hreflang="sh" data-title="Brzina svjetlosti" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbokroatisk" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%86%E0%B6%BD%E0%B7%9D%E0%B6%9A%E0%B6%BA%E0%B7%9A_%E0%B7%80%E0%B7%9A%E0%B6%9C%E0%B6%BA" title="ආලෝකයේ වේගය – singalesisk" lang="si" hreflang="si" data-title="ආලෝකයේ වේගය" data-language-autonym="සිංහල" data-language-local-name="singalesisk" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Speed_of_light" title="Speed of light – Simple English" lang="en-simple" hreflang="en-simple" data-title="Speed of light" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://sk.wikipedia.org/wiki/R%C3%BDchlos%C5%A5_svetla_vo_v%C3%A1kuu" title="Rýchlosť svetla vo vákuu – slovakisk" lang="sk" hreflang="sk" data-title="Rýchlosť svetla vo vákuu" data-language-autonym="Slovenčina" data-language-local-name="slovakisk" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Hitrost_svetlobe" title="Hitrost svetlobe – slovensk" lang="sl" hreflang="sl" data-title="Hitrost svetlobe" data-language-autonym="Slovenščina" data-language-local-name="slovensk" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-smn mw-list-item"><a href="https://smn.wikipedia.org/wiki/%C4%8Cuov%C3%A2li%C3%A4htu" title="Čuovâliähtu – enaresamisk" lang="smn" hreflang="smn" data-title="Čuovâliähtu" data-language-autonym="Anarâškielâ" data-language-local-name="enaresamisk" class="interlanguage-link-target"><span>Anarâškielâ</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Xawaaraha_Ileyska" title="Xawaaraha Ileyska – somali" lang="so" hreflang="so" data-title="Xawaaraha Ileyska" data-language-autonym="Soomaaliga" data-language-local-name="somali" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Shpejt%C3%ABsia_e_drit%C3%ABs" title="Shpejtësia e dritës – albansk" lang="sq" hreflang="sq" data-title="Shpejtësia e dritës" data-language-autonym="Shqip" data-language-local-name="albansk" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%91%D1%80%D0%B7%D0%B8%D0%BD%D0%B0_%D1%81%D0%B2%D0%B5%D1%82%D0%BB%D0%BE%D1%81%D1%82%D0%B8" title="Брзина светлости – serbisk" lang="sr" hreflang="sr" data-title="Брзина светлости" data-language-autonym="Српски / srpski" data-language-local-name="serbisk" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-stq mw-list-item"><a href="https://stq.wikipedia.org/wiki/Luchtgauegaid" title="Luchtgauegaid – Saterland Frisian" lang="stq" hreflang="stq" data-title="Luchtgauegaid" data-language-autonym="Seeltersk" data-language-local-name="Saterland Frisian" class="interlanguage-link-target"><span>Seeltersk</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Laju_cahaya" title="Laju cahaya – sundanesisk" lang="su" hreflang="su" data-title="Laju cahaya" data-language-autonym="Sunda" data-language-local-name="sundanesisk" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Ljusets_hastighet" title="Ljusets hastighet – svensk" lang="sv" hreflang="sv" data-title="Ljusets hastighet" data-language-autonym="Svenska" data-language-local-name="svensk" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Kasi_ya_nuru" title="Kasi ya nuru – swahili" lang="sw" hreflang="sw" data-title="Kasi ya nuru" data-language-autonym="Kiswahili" data-language-local-name="swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%92%E0%AE%B3%E0%AE%BF%E0%AE%AF%E0%AE%BF%E0%AE%A9%E0%AF%8D_%E0%AE%B5%E0%AF%87%E0%AE%95%E0%AE%AE%E0%AF%8D" title="ஒளியின் வேகம் – tamil" lang="ta" hreflang="ta" data-title="ஒளியின் வேகம்" data-language-autonym="தமிழ்" data-language-local-name="tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%95%E0%B0%BE%E0%B0%82%E0%B0%A4%E0%B0%BF_%E0%B0%B5%E0%B1%87%E0%B0%97%E0%B0%82" title="కాంతి వేగం – telugu" lang="te" hreflang="te" data-title="కాంతి వేగం" data-language-autonym="తెలుగు" data-language-local-name="telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%A1%D1%83%D1%80%D1%8A%D0%B0%D1%82%D0%B8_%D1%80%D3%AF%D1%88%D0%BD%D0%BE%D3%A3" title="Суръати рӯшноӣ – tadsjikisk" lang="tg" hreflang="tg" data-title="Суръати рӯшноӣ" data-language-autonym="Тоҷикӣ" data-language-local-name="tadsjikisk" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%B1%E0%B8%95%E0%B8%A3%E0%B8%B2%E0%B9%80%E0%B8%A3%E0%B9%87%E0%B8%A7%E0%B8%82%E0%B8%AD%E0%B8%87%E0%B9%81%E0%B8%AA%E0%B8%87" title="อัตราเร็วของแสง – thai" lang="th" hreflang="th" data-title="อัตราเร็วของแสง" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Bilis_ng_liwanag" title="Bilis ng liwanag – tagalog" lang="tl" hreflang="tl" data-title="Bilis ng liwanag" data-language-autonym="Tagalog" data-language-local-name="tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/I%C5%9F%C4%B1k_h%C4%B1z%C4%B1" title="Işık hızı – tyrkisk" lang="tr" hreflang="tr" data-title="Işık hızı" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%AF%D0%BA%D1%82%D1%8B%D0%BB%D1%8B%D0%BA_%D1%82%D0%B8%D0%B7%D0%BB%D0%B5%D0%B3%D0%B5" title="Яктылык тизлеге – tatarisk" lang="tt" hreflang="tt" data-title="Яктылык тизлеге" data-language-autonym="Татарча / tatarça" data-language-local-name="tatarisk" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-udm mw-list-item"><a href="https://udm.wikipedia.org/wiki/%D0%AE%D0%B3%D1%8B%D1%82%D0%BB%D1%8D%D0%BD_%D3%9D%D0%BE%D0%B3%D0%BB%D1%8B%D0%BA%D0%B5%D0%B7" title="Югытлэн ӝоглыкез – udmurt" lang="udm" hreflang="udm" data-title="Югытлэн ӝоглыкез" data-language-autonym="Удмурт" data-language-local-name="udmurt" class="interlanguage-link-target"><span>Удмурт</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A8%D0%B2%D0%B8%D0%B4%D0%BA%D1%96%D1%81%D1%82%D1%8C_%D1%81%D0%B2%D1%96%D1%82%D0%BB%D0%B0" title="Швидкість світла – ukrainsk" lang="uk" hreflang="uk" data-title="Швидкість світла" data-language-autonym="Українська" data-language-local-name="ukrainsk" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%B1%D9%88%D8%B4%D9%86%DB%8C_%DA%A9%DB%8C_%D8%B1%D9%81%D8%AA%D8%A7%D8%B1" title="روشنی کی رفتار – urdu" lang="ur" hreflang="ur" data-title="روشنی کی رفتار" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Yorug%CA%BBlik_tezligi" title="Yorugʻlik tezligi – usbekisk" lang="uz" hreflang="uz" data-title="Yorugʻlik tezligi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbekisk" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vec mw-list-item"><a href="https://vec.wikipedia.org/wiki/Ve%C5%82osit%C3%A0_de_%C5%82a_%C5%82uze" title="Vełosità de ła łuze – Venetian" lang="vec" hreflang="vec" data-title="Vełosità de ła łuze" data-language-autonym="Vèneto" data-language-local-name="Venetian" class="interlanguage-link-target"><span>Vèneto</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/Vauktusen_piguz" title="Vauktusen piguz – Veps" lang="vep" hreflang="vep" data-title="Vauktusen piguz" data-language-autonym="Vepsän kel’" data-language-local-name="Veps" class="interlanguage-link-target"><span>Vepsän kel’</span></a></li><li class="interlanguage-link interwiki-vi badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://vi.wikipedia.org/wiki/T%E1%BB%91c_%C4%91%E1%BB%99_%C3%A1nh_s%C3%A1ng" title="Tốc độ ánh sáng – vietnamesisk" lang="vi" hreflang="vi" data-title="Tốc độ ánh sáng" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamesisk" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Kalaksi_han_lamrag" title="Kalaksi han lamrag – waray" lang="war" hreflang="war" data-title="Kalaksi han lamrag" data-language-autonym="Winaray" data-language-local-name="waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%85%89%E9%80%9F" title="光速 – wu-kinesisk" lang="wuu" hreflang="wuu" data-title="光速" data-language-autonym="吴语" data-language-local-name="wu-kinesisk" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%92%D7%99%D7%9A_%D7%A4%D7%95%D7%9F_%D7%9C%D7%99%D7%9B%D7%98" title="גיך פון ליכט – jiddisch" lang="yi" hreflang="yi" data-title="גיך פון ליכט" 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id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Lysets_hastighed&oldid=11523037" title="Permanent link til denne version af denne side"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Lysets_hastighed&action=info" title="Yderligere oplysninger om denne side"><span>Sideinformation</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Speciel:Citer&page=Lysets_hastighed&id=11523037&wpFormIdentifier=titleform" title="Information om, hvordan man kan citere denne side"><span>Referer til denne side</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Speciel:UrlShortener&url=https%3A%2F%2Fda.wikipedia.org%2Fwiki%2FLysets_hastighed"><span>Hent forkortet URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Speciel:QrCode&url=https%3A%2F%2Fda.wikipedia.org%2Fwiki%2FLysets_hastighed"><span>Download 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bog</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Speciel:DownloadAsPdf&page=Lysets_hastighed&action=show-download-screen"><span>Download som PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Lysets_hastighed&printable=yes" title="Printervenlig udgave af denne side [p]" accesskey="p"><span>Udskriftsvenlig udgave</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> I andre projekter </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Speed_of_light" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2111" title="Link til tilknyttet emne i Wikidata [g]" accesskey="g"><span>Wikidata-element</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Sideværktøjer"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Udseende"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Udseende</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">flyt til sidebjælken</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">skjul</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Fra Wikipedia, den frie encyklopædi</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="da" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Speed_of_light_from_Earth_to_Moon_400px.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Speed_of_light_from_Earth_to_Moon_400px.gif/220px-Speed_of_light_from_Earth_to_Moon_400px.gif" decoding="async" width="220" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Speed_of_light_from_Earth_to_Moon_400px.gif/330px-Speed_of_light_from_Earth_to_Moon_400px.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/3/3c/Speed_of_light_from_Earth_to_Moon_400px.gif 2x" data-file-width="400" data-file-height="36" /></a><figcaption>Lysets færd fra Jorden til Månen i realtid</figcaption></figure> <p><b>Lysets hastighed</b> eller <b>lysets fart</b> er den <a href="/wiki/Fart" title="Fart">fart</a>, hvormed elektromagnetiske svingninger udbreder sig i et medium. I <a href="/wiki/Vakuum" title="Vakuum">vakuum</a> er <a href="/wiki/Lys" title="Lys">lysets</a> hastighed maksimal, og siden 1983 er <a href="/wiki/Meter" title="Meter">meteren</a> defineret som den <a href="/wiki/L%C3%A6ngde" title="Længde">længde</a>, lyset tilbagelægger i vakuum på 1/299.792.458 <a href="/wiki/Sekund" title="Sekund">sekunder</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>. Det vil sige, at lysets hastighed er 299.792.458 meter per sekund eller tæt på 300.000 km/s. I andre medier end vakuum er lysets hastighed mindre, se <a href="/wiki/Brydningsindeks" title="Brydningsindeks">brydningsindeks</a>. I <a href="/wiki/Partikel_(fysik)" title="Partikel (fysik)">partikelmodellen</a> opfattes lys som en strøm af masseløse partikler, såkaldte <a href="/wiki/Foton" title="Foton">fotoner</a>, og lysets hastighed bliver så den hastighed, hvormed fotoner bevæger sig. Fotoner er masseløse men kan overføre impuls (bevægelsesmængde). </p><p>Da lysets hastighed er så stor i forhold til hastigheden i hverdagens bevægelser – f.eks. bevæger lyset sig cirka en million gange så hurtigt, som <a href="/wiki/Lyd" title="Lyd">lyd</a> udbreder sig i atmosfærisk luft ved standardbetingelserne – troede man indtil <a href="/wiki/Oplysningstiden" title="Oplysningstiden">oplysningstiden</a>, at den var uendelig. <a href="/wiki/Ole_R%C3%B8mer" title="Ole Rømer">Ole Rømer</a> kunne imidlertid ved at studere tidspunkterne for indtrædelsen af <a href="/wiki/Jupiter_(planet)" title="Jupiter (planet)">Jupiters</a> <a href="/wiki/M%C3%A5neform%C3%B8rkelse" title="Måneformørkelse">formørkelse</a> af månen <a href="/wiki/Io_(m%C3%A5ne)" title="Io (måne)">Io</a> iagttage <b>lysets tøven</b>, altså at lysets fart måtte være endelig. Desværre beskrev Rømer ikke selv sin opdagelse; vi kender den primært fra et fejlbehæftet referat på fransk og fra brevveksling blandt tidens videnskabsmænd. Imidlertid synes referatet at vise, at Rømer bestemte lysets tøven til at være 11 minutter for jordbanens radius, hvilket giver en fart på o. 225.600 km/s – en afvigelse på ca. 33% fra den nu kendte. </p><p>I midten af 1800-tallet tilrettelagde <a href="/w/index.php?title=Fizeau&action=edit&redlink=1" class="new" title="Fizeau (ikke skrevet endnu)">Fizeau</a> og <a href="/wiki/Jean-Bernard-L%C3%A9on_Foucault" class="mw-redirect" title="Jean-Bernard-Léon Foucault">Foucault</a> eksperimenter til bestemmelse af lysets fart i luft og kom frem til resultater, der ligger tæt på den moderne værdi. En teoretisk beregning af lysets fart blev mulig, da <a href="/wiki/Maxwell" class="mw-redirect" title="Maxwell">Maxwell</a> fremlagde en samlet matematisk formulering af <a href="/wiki/Elektromagnetisme" title="Elektromagnetisme">elektromagnetismen</a>. Lysets fart i vakuum (<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle c}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>c</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle c}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/86a67b81c2de995bd608d5b2df50cd8cd7d92455" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.007ex; height:1.676ex;" alt="{\displaystyle c}"></span>) kan herefter vises at være givet ved </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle c={\frac {1}{\sqrt {\epsilon _{0}\mu _{0}}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>c</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msqrt> <msub> <mi>ϵ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </msqrt> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle c={\frac {1}{\sqrt {\epsilon _{0}\mu _{0}}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a875cc9a912369ab9ce01b3ac1efb0885f708c07" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.838ex; width:11.332ex; height:6.176ex;" alt="{\displaystyle c={\frac {1}{\sqrt {\epsilon _{0}\mu _{0}}}}}"></span></dd></dl> <p>hvor <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \epsilon _{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>ϵ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \epsilon _{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d2cae6289b0fe626d1f9472a3416ac73e87bc5a3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.998ex; height:2.009ex;" alt="{\displaystyle \epsilon _{0}}"></span> og <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mu _{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mu _{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/fe2fd9b8decb38a3cd158e7b6c0c6e2d987fefcc" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:2.456ex; height:2.176ex;" alt="{\displaystyle \mu _{0}}"></span> betegner hhv. <a href="/wiki/Vakuumpermittiviteten" title="Vakuumpermittiviteten">vakuumpermittiviteten</a> og <a href="/wiki/Permeabilitet_(elektromagnetisme)" title="Permeabilitet (elektromagnetisme)">vakuumpermeabiliteten</a>. </p><p>En stribe <a href="/wiki/Interferens" title="Interferens">interferometriske</a> eksperimenter udført af Michelson og Morley omkring år 1900 viste, at lysets hastighed ikke afhænger af den relative <a href="/wiki/Hastighed" title="Hastighed">hastighed</a> mellem kilde og observatør. Det blev dødsstødet for <a href="/wiki/%C3%86terteorien" class="mw-redirect" title="Æterteorien">æterteorien</a>, der gik ud på, at lyset skulle udbrede sig i et særligt medium, æteren, som udfyldte tomrummet mellem materielle legemer, og i forhold til hvilken lysets hastighed skulle måles. </p><p>Lysets vakuumhastighed spiller en central rolle i <a href="/wiki/Albert_Einstein" title="Albert Einstein">Einsteins</a> <a href="/wiki/Specielle_relativitetsteori" class="mw-redirect" title="Specielle relativitetsteori">specielle relativitetsteori</a>, der bl.a. forudsiger, at <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle c}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>c</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle c}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/86a67b81c2de995bd608d5b2df50cd8cd7d92455" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.007ex; height:1.676ex;" alt="{\displaystyle c}"></span> er den øvre grænse for, hvor hurtigt noget kan bevæge sig. Forsøg på at falsificere denne forudsigelse, f.eks. de af Günther Nimtz i 1990'erne udførte forsøg på at realisere <a href="/wiki/Overlyshastighed" title="Overlyshastighed">overlyshastighed</a> ved <a href="/wiki/Kvantemekanisk_tunnelering" title="Kvantemekanisk tunnelering">kvantemekanisk tunnelering</a> under udnyttelse af Hartmann-effekten, er indtil videre slået fejl.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>I dag er lysets vakuumhastighed fastsat ved definition og kan derfor ikke bestemmes eksperimentelt eller mere præcist. <a href="/wiki/Meter" title="Meter">Meteren</a> er derimod defineret som den strækning lyset bevæger sig i vakuum på 1/299.792.458 sekund, og kan derfor bestemmes eksperimentelt og med større og større nøjagtighed. Lysets hastighed danner endvidere udgangspunkt for den astronomiske afstandsenhed <a href="/wiki/Lys%C3%A5r" title="Lysår">lysår</a>. </p><p>Selvom det ikke længere giver mening at måle lysets hastighed i vakuum, udføres der fortsat forsøg med lysets hastighed. I 2001 lykkedes det eksempelvis <a href="/wiki/Lene_Vestergaard_Hau" class="mw-redirect" title="Lene Vestergaard Hau">Lene Vestergaard Hau</a> og hendes gruppe at bremse lyset til gangfart uden tab af fasekohærens. </p> <div class="mw-heading mw-heading2"><h2 id="Se_også"><span id="Se_ogs.C3.A5"></span>Se også</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lysets_hastighed&veaction=edit&section=1" title="Redigér afsnit: Se også" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lysets_hastighed&action=edit&section=1" title="Edit section's source code: Se også"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Cherenkovstr%C3%A5ling" title="Cherenkovstråling">Cherenkovstråling</a></li> <li><a href="/wiki/Hesitation_of_Light" title="Hesitation of Light">Hesitation of Light</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Kilder">Kilder</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lysets_hastighed&veaction=edit&section=2" title="Redigér afsnit: Kilder" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lysets_hastighed&action=edit&section=2" title="Edit section's source code: Kilder"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r11780210">.mw-parser-output .reflist{font-size:90%;margin-bottom:0.5em;list-style-type:decimal}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">^</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.bipm.org/en/CGPM/db/17/1/">www.bipm.org/en/CGPM/db/17/1/</a></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">^</a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r11752076">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20030804060608/http://theory.gsi.de/~vanhees/faq/nimtz/nimtz.html">"www.theory.gsi.de"</a>. 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