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

Without sugar, life would look out at fields of brussels sprouts stretching to the event horizon and go right back to bed. — Pat Beall, Sun Sentinel, 17 July 2026

That region is the light-trapping outer boundary of the black hole known as the event horizon, which prevents us from ever seeing the singularity at the heart of the black hole or receiving information from it. — Robert Lea, Space.com, 16 July 2026

The last stop in space took us to just outside the event horizon of Sagittarius A*, the unimaginably enormous black hole at the center of the Milky Way. — Rob Pegoraro, ArsTechnica, 3 July 2026

Rather than photographing the black hole itself, the telescope captured glowing material orbiting just outside its event horizon. — Kaif Shaikh, Interesting Engineering, 29 June 2026

Word History

First Known Use

1956, in the meaning defined above

Rhymes for event horizon

• mizen
• spiegeleisen