Jisho

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じしょうちへいめん 事象の地平面
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Expressions (phrases, clauses, etc.), Noun
1. event horizon​Astronomy, See also 事象の地平線
Wikipedia definition
2. Event horizon​In general relativity, an event horizon is a boundary in spacetime beyond which events cannot affect an outside observer. In layman's terms it is defined as "the point of no return" i.e. the point at which the gravitational pull becomes so great as to make escape impossible. The most common case of an event horizon is that surrounding a black hole. Light emitted from beyond the horizon can never reach the observer.
Read “Event horizon” on English Wikipedia
Read “事象の地平面” on Japanese Wikipedia
Read “Event horizon” on DBpedia

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