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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]
An event horizon is a boundary around a black hole inside which events cannot affect an outside observer. Event horizon or Event Horizon may also refer to: Event Horizon Telescope, a type of astronomical interferometer; Event Horizon, a 1997 science fiction/horror film; Event Horizon, a 2007 site installation by Antony Gormley
Event Horizon is a 1997 science fiction horror film directed by Paul 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 ...
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Within an apparent horizon, light does not move outward; this is in contrast with the event horizon. In a dynamical spacetime, there can be outgoing light rays exterior to an apparent horizon (but still interior to the event horizon). An apparent horizon is a local notion of the boundary of a black hole, whereas an event horizon is a global notion.
2019 – The Event Horizon Telescope Collaboration publishes the image of the black hole at the center of the M87 Galaxy. [114] This is the first time astronomers have ever captured an image of a black hole , which once again proves the existence of black holes and thus helps verify Einstein 's general theory of relativity . [ 115 ]
At or inside the event horizon of a black hole, it is not possible for such an observer to remain fixed; all observers are drawn toward the black hole. [14] Mitra argues that he has proven that the world-line of an in-falling test particle would tend to be lightlike at the event horizon, independent of the definition of "velocity". [3] [15]
The galaxy is also the fifth-brightest in the sky, [13] making it an ideal amateur astronomy target. [14] It is only visible from the southern hemisphere and low northern latitudes. The center of the galaxy contains a supermassive black hole with a mass of 55 million solar masses , [ 15 ] which ejects a relativistic jet that is responsible for ...