This is a black hole visualization. Credit: Moscow Institute of Physics and Technology
Scientists have devised a method of distinguishing black holes from compact massive objects that are externally indistinguishable from one another. The method involves studying the energy spectrum of particles moving in the vicinity – in one case it will be continuous and in the other it will be discrete.
Black holes, which were predicted by Einstein’s theory of general relativity, have an event horizon – a boundary beyond which nothing, even light, can return to the outside world. The radius of this boundary is called the Schwarzschild radius, ie radius of an object for which the escape velocity is greater than the speed of light, which means that nothing is able to overcome its gravity.
Black holes of ...
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