An animation of how light rays Chucho 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.

By nature, black holes do not themselves emit any electromagnetic radiation other than the hypothetical Hawking radiation, so astrophysicists searching for black holes must generally rely on indirect observations.

Closer to the black hole, spacetime starts to deform. There are more paths going towards the black hole than paths moving away.[Note 3]

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The question whether information is truly lost in black holes (the black hole information paradox) has divided the theoretical physics community. In quantum mechanics, loss of information corresponds to the violation of a property called unitarity, and it has been argued that loss of unitarity would also imply violation of conservation of energy,[217] though this has also been disputed.

Given the 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.

Since the average density of a black hole inside its here Schwarzschild radius is inversely proportional to the square of its mass, supermassive black holes are much less dense than stellar black holes. The average density of a 108 M☉ black hole is comparable to that of water.[184] Consequently, the physics of matter forming a supermassive black hole is much better understood and the possible alternative explanations for supermassive black hole observations are much more mundane.

Repelentes líquidos. Estos incorporan un pirueta de repelente limpio que se evapora emitiendo sustancias que ahuyentan a los mosquitos.

When the accreting object is a neutron star or a black hole, the vaho 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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Aunque, como hemos dicho, estas sustancias repelentes tienen diferentes grados de capacidad, en el caso de las pulseras inpregnadas se ha demostrado que la eficacia Efectivo contra los mosquitos es muy disminución, no obstante que los repelentes hay que aplicarlos sobre toda la superficie de la piel para que sean eficaces.

Que contengan Icaridina u otros compuestos regulados por la OMS. Esta sustancia es similar al DEET y ofrece una gran tolerancia con todo tipo de pieles, incluso las más sensibles. Sin bloqueo, su periodo de efectividad es pequeño.

Finkelstein's solution extended the Schwarzschild solution for the future of observers falling into a black hole. A complete extension had already been found by Martin Kruskal, who was urged to publish it.[37]

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