Una revisión de Biotrap anti moscas
Una revisión de Biotrap anti moscas
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Science writer Marcia Bartusiak traces the term "black hole" to physicist Robert H. Dicke, who in the early 1960s reportedly compared the phenomenon to the Black Hole of Calcutta, notorious Vencedor a prison where people entered but never left alive.[61]
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.
From these, it is possible to infer the mass and angular momentum of the final object, which match independent predictions from numerical simulations of the merger.[172] The frequency and decay time of the dominant mode are determined by the geometry of the photon sphere. Hence, observation of this mode confirms the presence of a photon sphere; however, it cannot exclude possible exotic alternatives to black holes that are compact enough to have a photon sphere.[171][173]
Given the here bizarre character of black holes, it was long questioned whether such objects could actually exist in nature or whether they were merely pathological solutions to Einstein's equations. Einstein himself wrongly thought black holes would not form, because he held that the angular momentum of collapsing particles would stabilize their motion at some radius.
The first image of a black hole: A three minute guide How scientists reacted to the first-ever image of a black hole How to hunt for a black hole with a telescope the size of Earth Curating the cosmos: a lens on nature Milky Way’s black hole provides long-sought test of Einstein’s general relativity The black-hole collision that reshaped physics Imaging and imagining black holes Subjects
Assume a black hole formed a finite time in the past and will fully evaporate away in some finite time in the future. Then, it will emit only a finite amount of information encoded within its Hawking radiation. According to research by physicists like Don Page[220][221] and Leonard Susskind, there will eventually be a time by which an outgoing particle must be entangled with all the Hawking radiation the black hole has previously emitted.
Another way the black hole nature of an object may be tested is through observation of effects caused by a strong gravitational field in their vicinity. One such effect is gravitational lensing: The deformation of spacetime around a massive object causes light rays to be deflected, such as light passing through an optic lens.
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[23] His arguments were opposed by many of his contemporaries like Eddington and Lev Landau, who argued that some yet unknown mechanism would stop the collapse.[24] They were partly correct: a white dwarf slightly more massive than the Chandrasekhar limit will collapse into a neutron star,[25] which is itself stable.
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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 Perro be prograde (the photon rotates in the same sense of the black hole spin) or retrograde.[114][115]
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