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In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer. Wolfgang Rindler coined the term in the 1950s. In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape.
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.
3 de mar. de 2023 · The event horizon is the spherical outer boundary of a black hole loosely considered to be its "surface." It is the point, according to NASA, that the gravitational...
Há 5 dias · Event horizon, boundary marking the limits of a black hole. At the event horizon, the escape velocity is equal to the speed of light. Since general relativity states that nothing can travel faster than the speed of light, nothing inside the event horizon can ever escape beyond it, including light.
- The Editors of Encyclopaedia Britannica
28 de mar. de 2024 · For the simplest black hole, the event horizon is a sphere with a radius called the Schwarzschild radius, named after the German physicist Karl Schwarzschild, who first calculated it. For a black hole with the mass of the Sun, the Schwarzschild radius is about 3 kilometers (1.9 miles).
The singularity in a Schwarzschild black hole is a so-called spacelike one—that essentially “cuts off time” for any geodesic, anywhere in space inside the event horizon. Discovered 50 years after the Schwarzschild solution is the Kerr solution , representing a rotating black hole.
The Schwarzschild metric tensor is both fundamental and useful, as it describes the curved spacetime around a black hole singularity, and is a good approximation to spacetime in the vicinity of gravitating bodies such as the Sun and the Earth.
