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Fabian said the total energy emitted by massive black holes could be 10-50 percent of that emitted by stars. These black holes, likely present in the centers of most galaxies, contain the mass of millions to billions of suns compressed to a region smaller than our solar system. They produce energy by accretion, the process of gas swirling into the black hole and attaining great velocity and temperature under extreme gravitational force at it nears the black hole.
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