event horizon

English

Pronunciation

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

• Audio (US):

  (file)

Noun

event horizon (plural event horizons)

2. (astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light.
3. (astrophysics) The furthest distance in the past of the universe from which light signals from an event can reach an observer at later times.
4. (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)
• Kurdish:

  Central Kurdish: ئاسۆی ڕووداو (asoy rûdaw)

• 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
• 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