An 'Even Horizon' Is Not a Thing, but an 'Event Horizon' Is.
The event horizon is the boundary around a black hole beyond which nothing, not even light, can escape. It marks the point of no return, a critical concept in general relativity.
Related Facts
Black Hole31 views
Gravitational Waves From Merging Black Holes Were First Detected in 2015
LIGO detected the ripples in spacetime on September 14, 2015, from two black holes that had collided over a billion years ago.
Black Hole27 views
Cygnus X-1 Was the First Widely Accepted Black Hole Candidate
The X-ray source was discovered in 1964, and its behavior convinced many astronomers it was a black hole.
Black Hole29 views
Stephen Hawking Predicted That Black Holes Slowly Lose Mass
In 1974 Hawking showed that black holes should emit faint radiation and eventually evaporate, though the effect has never been observed directly.
Black Hole30 views
Sagittarius A* Holds About Four Million Times the Mass of the Sun
The supermassive black hole at our galaxy's center was imaged for the first time in 2022.