Black hole is an object that its density is very high so that can trap light forever. This is a very interesting electronic effects seen from the nature of light gravity. When the frequency is concerned with photons moving towards the earth increases, the frequency of photons moving away from Earth must diminish.
Earth's gravitational field is so strong, but the gravitational field of many stars is very strong. For example the frequency of photons originally emitted by a star f mass M and radius R, as in the equation of Newton's laws of gravity.
At a great distance from the star as on earth, the photons are beyond the reach of the gravitational field of a star, but its total energy fixed. Photon energy was now entirely in the form of electromagnetic waves with frequency f shows coming.
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