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In astrophysics, an event horizon is a boundary beyond which events cannot affect an outside observer. Wolfgang Rindler coined the term in the 1950s. [1]In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape. [2]
A horizon is a boundary in spacetime satisfying prescribed conditions. There are several types of horizons that play a role in Albert Einstein 's theory of general relativity : Absolute horizon , a boundary in spacetime in general relativity inside of which events cannot affect an external observer
This is the set of points which are approached asymptotically by null rays (light rays, for example) which can escape to infinity. This is the technical meaning of "external universe". These points are only defined in an asymptotically flat universe. An absolute horizon is defined as the past null cone of future null infinity. [1] [2] [3]
'90s Week: The 1997 sci-fi horror film flopped in theaters and with critics. On its 25th anniversary, the director tells us about the one thing that made audiences take a second look.
The black hole event horizon bordering exterior region I would coincide with a Schwarzschild t-coordinate of + while the white hole event horizon bordering this region would coincide with a Schwarzschild t-coordinate of , reflecting the fact that in Schwarzschild coordinates an infalling particle takes an infinite coordinate time to reach the ...
When Paramount got its first look at a cut of “Event Horizon” in 1997, some studio executives thought that director Paul W.S. Anderson had made a film so disturbing that it slandered outer ...
Event Horizon is a 1997 science fiction horror film directed by Paul W. S. Anderson and written by Philip Eisner. It stars Laurence Fishburne, Sam Neill, ...
These concentric event horizons become degenerate for 2r Q = r s, which corresponds to an extremal black hole. Black holes with 2 r Q > r s cannot exist in nature because if the charge is greater than the mass there can be no physical event horizon (the term under the square root becomes negative). [ 9 ]