Although by definition it is tangible or intangible completely black, the existence of black holes can speculate through its interaction with the surrounding physical environment, such as light and radiation. The matter falls into the black hole accretion forming region, [7] here the physical collision and friction with each other, become plasma state emit high intensity radiation; environmental causes around the black hole became one of the brightest objects in the universe. If there is a star orbiting a black hole, its shape and its orbital period allows astronomers to calculate the mass of the black hole and the distance to it. These data help them distinguish specific celestial black hole or neutron star is ... In this way, many black holes are found in binary star systems, and in the center of the Milky Way has a supermassive black hole volume was approximately 4.3 million solar masses. [8
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