event horizon

English

Pronunciation

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

• Audio (US)

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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 (ʔufuq al-ḥadaṯ)
• Armenian: իրադարձությունների հորիզոն (iradarjutʻyunneri horizon)
• Asturian: horizonte de sucesos m
• Azerbaijani: hadisə üfüqü
• Basque: gertaeren muga
• Belarusian: гарызонт падзей m (haryzónt padzjej)
• Bengali: ঘটনা দিগন্ত (ghoṭona digonto)
• 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 (nl) 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 (hu)
• 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 (sambhavacakravāḷaṁ)
• 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 (ru) 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 (اfq oqe'h)
• 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