Event Horizon ❲8K❳

Light emitted from the object would be stretched to longer, redder wavelengths until it vanishes from view [5.6].

The term was coined in the 1960s by American physicist John Archibald Wheeler (who also popularized the term "black hole"). Wheeler chose the word "horizon" deliberately. Just as the Earth’s horizon is a line where the sky meets the ground—a point beyond which you cannot see—the black hole’s horizon is a line where the laws of physics as we know them stop returning information. Event Horizon

The Event Horizon is a region of intense gravitational field and spacetime curvature. According to general relativity, the curvature of spacetime around a black hole is so extreme that it creates a boundary beyond which nothing can escape. Light emitted from the object would be stretched

We cannot see inside. We can never know what lies beyond. But by studying the edge of the abyss, we are slowly learning the deepest secrets of space, time, and reality itself. Just as the Earth’s horizon is a line

We are entering the golden age of black hole physics. The next generation of the Event Horizon Telescope will produce movies of the event horizon in motion. The Laser Interferometer Space Antenna (LISA), a space-based gravitational wave detector, will soon listen to the "ringing" of spacetime as smaller objects merge, testing the "no-hair theorem"—the idea that an event horizon has no features other than mass, spin, and charge.