event horizon

noun

: the surface of a black hole : the boundary of a black hole beyond which nothing can escape from within it

Examples of event horizon in a Sentence

Recent Examples on the Web

Now, a team of researchers assessed this signal and found a feature in the gravitational waves represents the collective event horizon of the involved black holes at the very moment of that collision. — Robert Lea, Space.com, 26 June 2026

Some physicists are skeptical that such waves could escape the intense gravitational environment near a black hole’s event horizon, or that current instruments can reliably separate a direct wave signal from the surrounding noise. — Sam MacDonald, Scientific American, 26 June 2026

However, for a more massive supermassive black hole, such as M87*, the entirety of the solar system would fit within the event horizon. — Mary Ogborn, The Conversation, 25 June 2026

Nothing can escape the black hole’s threshold, called the event horizon. — Jacopo Prisco, CNN Money, 16 June 2026

Word History

First Known Use

1956, in the meaning defined above

Rhymes for event horizon

• mizen
• spiegeleisen