Astronomers have identified numerous stellar black hole candidates in binary systems by studying the movement of their companion stars in this way. From stellar movement, the mass and location of an invisible companion object can be calculated in a number of cases the only known object capable of meeting these criteria is a black hole. In particular, there is strong evidence of a black hole of more than 4 million solar masses at the center of our galaxy, the Milky Way.ĭespite its invisible interior, the presence of a black hole can be inferred through its interaction with other matter and with light and other electromagnetic radiation. There is general consensus that supermassive black holes exist in the centers of most galaxies. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses may form. After a black hole has formed it can continue to grow by absorbing mass from its surroundings. The discovery of neutron stars sparked interest in gravitationally collapsedcompact objects as a possible astrophysical reality.īlack holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. Long considered a mathematical curiosity, it was during the 1960s that theoretical work showed black holes were a generic prediction of general relativity.
The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was not fully appreciated for another four decades. Objects whose gravity field is too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater. Quantum mechanics predicts that black holes emit radiation like a black body with a finite temperature. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body inthermodynamics. Around a black hole there is a mathematically defined surface called anevent horizon that marks the point of no return. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. I searched some knowledge about the black hole in chinese from baidu
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