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The photon sphere is a spherical boundary of zero thickness in which photons that move on tangents to that sphere would be trapped in a circular orbit about the black hole. For non-rotating black holes, the photon sphere has a radius 1.5 times the Schwarzschild radius.
Penrose process. The Penrose process (also called Penrose mechanism) is theorised by Sir Roger Penrose as a means whereby energy can be extracted from a rotating black hole. [1] [2] [3] The process takes advantage of the ergosphere – a region of spacetime around the black hole dragged by its rotation faster than the speed of light, meaning ...
A photon sphere [1] or photon circle [2] is an area or region of space where gravity is so strong that photons are forced to travel in orbit and hence exhibit boomerang-like properties. Hence, it make sense to call any such photon a boomerang photon. [2] In the case the orbit is circular then we refer to such photon orbit as the last photon ...
A black hole with modest angular momentum has an ergosphere with a shape approximated by an oblate spheroid, while faster spins produce a more pumpkin-shaped ergosphere. The equatorial (maximal) radius of an ergosphere is the Schwarzschild radius, the radius of a non-rotating black hole. The polar (minimal) radius is also the polar (minimal ...
The glasses came off, and the stunning visual of the moon covering the sun, a black sphere surrounded by streaming white light, more spectacular than any photograph can capture, dominated the sky.
Sphere (also called Sphere at the Venetian Resort) is a music and entertainment arena in Paradise, Nevada, United States, east of the Las Vegas Strip. Designed by Populous, the project was announced by the Madison Square Garden Company in 2018, known then as the MSG Sphere. The 18,600-seat auditorium is being marketed for its immersive video ...
Sphere. A sphere (from Greek σφαῖρα, sphaîra) [1] is a geometrical object that is a three-dimensional analogue to a two-dimensional circle. Formally, a sphere is the set of points that are all at the same distance r from a given point in three-dimensional space. [2]
Black-body radiation. Black-body radiation is the thermal electromagnetic radiation within, or surrounding, a body in thermodynamic equilibrium with its environment, emitted by a black body (an idealized opaque, non-reflective body). It has a specific, continuous spectrum of wavelengths, inversely related to intensity, that depend only on the ...
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