event horizon

event horizon

English

Pronunciation

• (General American) IPA^(key): /əˈvɛnt həˈɹaɪ.zən/, /-zɪn/, [əˈvɛɾ̃ həˈɹaɪ.zən], [əˈvɛn -], [-zɪn]

Noun

event horizon (plural event horizons)

1. (astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light.
2. (by extension) A point of no return.

Coordinate terms

(astrophysics):

• singularity
• ergosphere
• photon sphere
• Schwarzschild radius
• frame dragging

Derived terms

• moral event horizon

Related terms

• absolute horizon
• apparent horizon
• Cauchy horizon
• dynamical horizon
• isolated horizon
• Killing horizon
• particle horizon

Translations

gravitational sphere within which light cannot escape

Afrikaans: waarnemingshorison Albanian: horizont i ngjarjes m, horizont i ngjarjeve m Arabic: أُفُق اَلْحَدَث‎ m (ʾufuq al-ḥadaṯ) Armenian: իրադարձությունների հորիզոն (iradarjutʿyunneri horizon) Asturian: horizonte de sucesos m Azerbaijani: hadisə üfüqü Basque: gertaeren muga Belarusian: гарызонт падзей m (haryzónt padzjej) Bengali: ঘটনা দিগন্ত (ghôṭôna digôntô) Bulgarian: хоризонт на събитията m (horizont na sǎbitijata) Burmese: ဖြစ်ရပ် မိုးကုတ်စက်ဝိုင်း (hpracrap mui:kutcak-wuing:) Catalan: horitzó d'esdeveniments m Chinese: Cantonese: 事界 (si6 gaai3) Mandarin: 事件視界／事件视界 (zh) (shìjiàn shìjiè), 事件穹界 (shìjiàn qióngjiè), 事界 (zh) (shìjiè) Czech: horizont událostí m Danish: begivenhedshorisont c Dutch: waarnemingshorizon m Esperanto: eventa horizonto Estonian: sündmuste horisont Faroese: hendingartrom f Finnish: tapahtumahorisontti (fi) French: horizon des événements (fr) m Georgian: მოვლენათა ჰორიზონტი (movlenata horizonṭi) German: Ereignishorizont (de) m Greek: ορίζοντας γεγονότων m (orízontas gegonóton) Hebrew: אופק אירועים‎ Hindi: घटना क्षितिज (ghaṭnā kṣitij) Hungarian: eseményhorizont Icelandic: sjónhvörf n pl, skynmörk n pl Indonesian: horizon peristiwa Interlingua: horizonte de eventos Irish: léaslíne theagmhais f Italian: orizzonte degli eventi m Japanese: 事象の地平面 (ja) (じしょうのちへいめん, jishō no chiheimen) Kazakh: оқиға көкжиегі (oqiğa kökjiegı) Korean: 사상(事象)의 지평선(地平線) (sasang'ui jipyeongseon) Latin: horizon eventuum m Latvian: notikumu horizonts m Lithuanian: įvykių horizontas m Macedonian: хоризонт на настани (horizont na nastani) Malayalam: സംഭവചക്രവാളം (sambhavacakravāḷaṃ) Maltese: orizzont avveniment m Norwegian: Bokmål: hendelseshorisont m Nynorsk: hendingshorisont m, hendingsrand Norwegian Nynorsk: hendelseshorisont Persian: افق رویداد‎ (fa) (ofoq-e ruydâd) Polish: horyzont zdarzeń (pl) m Portuguese: horizonte de eventos m Punjabi: ਇਵੈਂਟ ਹੌਰਿਜ਼ਨ (ivaiṇṭ haurizan) Romanian: orizontul evenimentelor, orizont de evenimente Russian: горизо́нт собы́тий m (gorizónt sobýtij), сфе́ра Шва́рцшильда f (sféra Švárcšilʹda) Serbo-Croatian: Cyrillic: хоризонт догађаја Roman: horizont događaja Slovak: horizont udalostí Slovene: horizont dogodkov m, dogódkovno obzórje n Spanish: horizonte de sucesos m, horizonte de eventos m Swedish: händelsehorisont (sv) c Tamil: நிகழ்வெல்லை (nikaḻvellai) Thai: ขอบฟ้าเหตุการณ์ (kòp-fáa-hàyt-gaan) Turkish: olay ufku (tr) Ukrainian: горизонт подій (uk) (horyzont podij) Urdu: افق وقیعہ‎ Uzbek: voqealar gorizonti Vietnamese: chân trời sự kiện (蹎𡗶事件) Welsh: gorwel digwyddiad m

See also

• general relativity
• special relativity

Further reading

• event horizon on Wikipedia.Wikipedia