Last Updated：2025/11/19

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

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event horizon

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Source Word

event horizon

IPA(Pronunciation)

/əˈvɛnt həˈɹaɪ.zən/

Noun

broadly

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

Japanese Meaning

（天体物理学）ブラックホールの重力の影響下で、逃げ出す速度が光速を超える境界、すなわち事象の地平線 / （比喩的に）後戻りできない地点、決定的な転換点