As early as two hundred years ago, Michelle and Laplacas predicted an invisible star with the law of gravitation. Because of its mass, the photons emitted by star were bound by their own gravity. This is the earliest spoken black hole (then known as a dark star), calculated by the law of gravitation, if it the sun were to become such a dark star, its radius would be only 3,000 meters. Coincidentally, such results can be obtained by using modern general relativistic calculations. Many theories are suppose to assumptions of black hole at present, and some theories think the mini black hole are all over the universe, but the cannot bound the photon. So we discussion the massive black hole in this paper. This kind of black hole is invisible, so we only can find the black hole according to the motion of celestial bodies to around of black hole. we can think the first cosmic velocity in black hole to achieve the light speed and exist energy transformation to kinetic energy to potential energy.

Poshan He. About photon and Black Hole. International Journal of New Developments in Engineering and Society (2019) Vol.3, Issue 4: 172-179. https://doi.org/10.25236/IJNDES.030423.

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