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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]
For a supermassive black hole, such as those found at a galaxy's center, this point lies within the event horizon, so an astronaut may cross the event horizon without noticing any squashing and pulling, although it remains only a matter of time, as once inside an event horizon, falling towards the center is inevitable. [7]
Event horizon, a boundary in spacetime beyond which events cannot affect the observer, thus referring to a black hole's boundary and the boundary of an expanding universe; Apparent horizon, a surface defined in general relativity; Cauchy horizon, a surface found in the study of Cauchy problems; Cosmological horizon, a limit of observability
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
Kugelblitz (German for "ball lightning") may refer to: . Kugelblitz (armoured fighting vehicle), a German self-propelled anti-aircraft gun used in World War II; Kugelblitz (astrophysics), a concentration of light so intense that it forms an event horizon and becomes self-trapped
Event horizon – Region in spacetime from which nothing can escape; Fail-safe – Design feature or practice; Hobson's choice – Free choice in which only one option is actually offered; Sunk cost – Cost that has already been incurred and cannot be recovered; Ultimatum – Final demand backed up by a threat; Window of opportunity – Period ...
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As the Schwarzschild radius is linearly related to mass, while the enclosed volume corresponds to the third power of the radius, small black holes are therefore much more dense than large ones. The volume enclosed in the event horizon of the most massive black holes has an average density lower than main sequence stars.