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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, Kathleen Quinlan and Joely Richardson. Set in 2047, it follows a crew of astronauts sent on a rescue mission after a missing spaceship, the Event Horizon, spontaneously appears in orbit around Neptune, only to discover that a sinister force ...
In astrophysics, an event horizon is a boundary beyond which events cannot affect an 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] At that time, the Newtonian theory of gravitation and the ...
The Event Horizon Telescope project is an international collaboration that was launched in 2009 [1] after a long period of theoretical and technical developments. On the theory side, work on the photon orbit [3] and first simulations of what a black hole would look like [4] progressed to predictions of VLBI imaging for the Galactic Center black hole, Sgr A*. [5] [6] Technical advances in radio ...
The Schwarzschild radius or the gravitational radius is a physical parameter in the Schwarzschild solution to Einstein's field equations that corresponds to the radius defining the event horizon of a Schwarzschild black hole. It is a characteristic radius associated with any quantity of mass. The Schwarzschild radius was named after the German astronomer Karl Schwarzschild, who calculated this ...
Hawking radiation is the theoretical quasi-thermal nearly black-body radiation released outside a black hole 's event horizon. This is counterintuitive because once ordinary electromagnetic radiation is inside the event horizon, it cannot escape. It is named after the physicist Stephen Hawking, who developed a theoretical argument for its existence in 1974. [1] Hawking radiation is predicted ...
where is the area of the event horizon, is the Boltzmann constant, and is the Planck length. This is often referred to as the Bekenstein–Hawking formula. The subscript BH either stands for "black hole" or "Bekenstein–Hawking". The black hole entropy is proportional to the area of its event horizon . The fact that the black hole entropy is also the maximal entropy that can be obtained by ...
The Schwarzschild black hole is characterized by a surrounding spherical boundary, called the event horizon, which is situated at the Schwarzschild radius ( ), often called the radius of a black hole. The boundary is not a physical surface, and a person who fell through the event horizon (before being torn apart by tidal forces) would not notice any physical surface at that position; it is a ...
Cosmological horizon. A cosmological horizon is a measure of the distance from which one could possibly retrieve information. [1] This observable constraint is due to various properties of general relativity, the expanding universe, and the physics of Big Bang cosmology. Cosmological horizons set the size and scale of the observable universe.
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