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A rotating black hole is a black hole that possesses angular momentum. In particular, it rotates about one of its axes of symmetry. All celestial objects – planets, stars , galaxies, black holes – spin. [1] [2] [3] The boundaries of a Kerr black hole relevant to astrophysics. Note that there are no physical "surfaces" as such.
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 that from the point of view of an outside observer any matter inside ...
As a black hole rotates, it twists spacetime in the direction of the rotation at a speed that decreases with distance from the event horizon. [3] This process is known as the Lense–Thirring effect or frame-dragging. [4]
Thereby the rotation of the black hole slows down. [115] ... Instead it will rapidly plunge toward the black hole close to the speed of light. [118] [119]
The Kerr metric or Kerr geometry describes the geometry of empty spacetime around a rotating uncharged axially symmetric black hole with a quasispherical event horizon.The Kerr metric is an exact solution of the Einstein field equations of general relativity; these equations are highly non-linear, which makes exact solutions very difficult to find.
The ISCO plays an important role in black hole accretion disks since it marks the inner edge of the disk. The ISCO should not be confused with the Roche limit, the innermost point where a physical object can orbit before tidal forces break it up. The ISCO is concerned with theoretical test particles, not real objects. In general terms, the ISCO ...
And once the two black holes finally collided, they were ejected by the strongest waves, which sent the supermassive black hole flying through space at over 1,300 miles per second, or 4,680,000 ...
The black hole was imaged using data collected in 2017 by the Event Horizon Telescope (EHT), with a final, ... corresponding to a rotation speed ≈ 0.4 c. [87]