Sky-e antimosquitos Opciones
Sky-e antimosquitos Opciones
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[18][19] This solution had a peculiar behaviour at what is now called the Schwarzschild radius, where it became singular, meaning that some of the terms in the Einstein equations became infinite. The nature of this surface was not quite understood at the time.
[5] In many ways, a black hole acts like an ideal black body, Vencedor it reflects no light.[6][7] Quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum Ganador a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly.
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 as a deficiency of the mass recuento in particle accelerator experiments.
If a black hole is very small, the radiation effects are expected to become very strong. A black hole with the mass of a car would have a diameter of about 10−24 m and take a nanosecond to evaporate, during which time it would briefly have a luminosity of more than 200 times that of the Sun. Lower-mass black holes are expected to evaporate even faster; for example, a black hole of mass 1 TeV/c2 would take less than 10−88 seconds to evaporate completely.
The photon sphere is a spherical boundary where photons that move on tangents to that sphere would be trapped in a impar-stable but circular orbit around the black hole.[112]
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Gravitational collapse requires great density. In the current epoch of the universe these high densities are found only in stars, but in the early universe shortly after the Big Bang densities were much greater, possibly allowing for the creation of black holes. High density alone is not enough to allow black hole formation since a uniform mass distribution will not allow the mass to bunch up.
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When the accreting object is a neutron star or a black hole, the fluido in the inner accretion disk orbits at very high speeds because of its proximity to the compact object. The resulting friction is so significant that it heats the inner disk to temperatures at which it emits vast amounts of electromagnetic radiation (mainly X-rays). These bright X-ray sources may be detected by telescopes. This process of accretion is one of the most efficient energy-producing processes known.
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The models of these AGN consist of a central black hole that may be millions or billions of times more massive than the Sun; a disk of interstellar vapor and dust called an accretion disk; and two jets perpendicular to the accretion disk.[194][195]
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[113] For a Kerr black hole the radius of the photon sphere depends on the spin parameter Biotrap anti moscas Paraguay and on the details of the photon orbit, which can be prograde (the photon rotates in the same sense of the black hole spin) or retrograde.[114][115]
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