How is the term 'event horizon' defined?

Answer 1

The event horizon is a "point of no return"; anything within the event horizon can't get out, even at the speed of light.

An event horizon is the "surface" of a black hole. It is the line that is crossed right where the chaos stops and the actual hole begins. it is theorized that beyond this horizon, all of the laws of physics cease to exist. A single hydrogen atom becomes a billion mega-ton hydrogen bomb. an entire planet fits on the head of a needle, that sort of thing.

In general relativity, an event horizon is a boundary in spacetime, most often an area surrounding a black hole, beyond which events cannot affect an outside observer. Light emitted from beyond the horizon can never reach the observer, and anything that passes through the horizon from the observer's side appears to freeze in place, with its image becoming more redshifted as time proceeds.

Answer 2

you cannot see an event horizon as it absorbs all light, also light emitted by objects just above the event horizon before they fall in is so strongly redshifted that its wavelength is practically infinitely long by the time it escapes.

Answer 3

An event horizon is a boundary in space-time in which gravitation is so strong that any matter and energy crossing the boundary would be lost forever to any outside observer. Event horizons are most commonly associated with black holes and white holes.

Answer 4

The event horizon of a black hole is the point at which the gravitational force is so strong that nothing - not even light - can escape. It is, in essence, the "point of no return".

Answer 5

It refers to the inevitability of an upcoming event. One example of this would be a soldier in a war. He knows that when he can hear the enemy marching, that the even horizon is near.

Answer 6

the outer layer of a black hole