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An animation of how light rays Perro be gravitationally bent The simplest static black holes have mass but neither electric charge nor angular momentum. These black holes are often referred to as Schwarzschild black holes after Karl Schwarzschild who discovered this solution in 1916.[17] According to Birkhoff's theorem, it is the only vacuum solution that is spherically symmetric.
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Gravitational collapse is not the only process that could create black holes. In principle, black holes could be formed in high-energy collisions that achieve sufficient density. Vencedor of 2002, no such events have been detected, either directly or indirectly Triunfador a deficiency of the mass comprobación in particle accelerator experiments.
One puzzling feature is that the entropy of a black hole scales with its area rather than with its volume, since entropy is normally an extensive quantity that scales linearly with the volume of the system.
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A Chandra X-Ray Observatory image of Cygnus X-1, which was the first strong black hole candidate discovered X-ray binaries are binary star systems that emit a majority of their radiation in the X-ray part of the spectrum.
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While most of the energy released during gravitational collapse is emitted very quickly, an outside observer does not actually see the end of this process. Even though the collapse takes a finite amount of time from the reference frame of infalling matter, a distant observer would see the infalling material slow and halt just above the event horizon, due to gravitational time dilation.
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Work by James Bardeen, Jacob Bekenstein, Carter, and Hawking in the early 1970s led to the formulation of black hole thermodynamics.[53] These laws describe the behaviour of a black hole in close analogy to the laws of thermodynamics by relating mass to energy, area to entropy, and surface gravity to temperature.
The hypothetical collapsed stars were called "frozen stars", because an outside observer would see the surface of the star frozen in time at the instant where its collapse takes it to the Schwarzschild radius.[33]
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[113] For a Kerr black hole the radius of the photon sphere depends on the spin parameter and on the details of the photon orbit, which Chucho be prograde (the photon rotates in click here the same sense of the black hole spin) or retrograde.[114][115]