what is event horizon of a black hole ?
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Answer:
Event horizon of a black hole
Far away from the black hole a particle can move in any direction. It is only restricted by the speed of light. ... Often, this is described as the boundary within which the black hole's escape velocity is greater than the speed of light.
Explanation:
PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ?
PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ?
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Answer:
The notion of an event horizon (EH) was originally based on escape velocity of light, meaning that light originating from EH boundary could escape, and light originating inside EH could cross it temporarily but would return. Later a strict definition was introduced as a boundary beyond which events cannot affect any outside observer at all. This strict definition of EH has caused information and firewall paradoxes, therefore Stephen Hawking has supposed an apparent horizon to be used. [1] [2]
In general relativity, an event horizon is a region in spacetime beyond which light cannot totally escape, because the gravitational pull of a massive object becomes so great as to make escape impossible. An event horizon is most commonly associated with black holes, but can, in principle, arise and evolve in exactly flat regions of spacetime if a hollow spherically symmetric thin shell of matter is collapsing in a vacuum spacetime. [3]
Any object approaching the horizon from the observer's side appears to slow down and never quite pass through the horizon,[1] with its image becoming more and more redshifted as time elapses. This means that the wavelength of the light emitted from the object is getting longer as the object moves away from the observer.[2].
The black hole event horizon is teleological in nature, meaning that we need to know the entire future space-time of the universe to determine the current location of the horizon, which is essentially impossible. Because of the purely theoretical nature of the event horizon boundary, the traveling object doesn't necessarily experience strange effects and does, in fact, pass through the calculatory boundary in a finite amount of proper time. [4]
More specific types of horizon include the related but distinct absolute and apparent horizons found around a black hole. Still other distinct notions include the Cauchy and Killing horizons; the photon spheres and ergospheres of the Kerr solution; particle and cosmological horizons relevant to cosmology; and isolated and dynamical horizons important in current black hole research.