Comparison of black holes by mass and temperature

Artist's illustration of a cold, heavy black hole at the centre of a galaxy, with 100 million times the mass of our Sun, heating its surroundings to thousands of degrees, compared to a smaller, superheated stellar black hole, with 10 times the mass of our Sun, but capable of heating its surroundings to millions of degrees. Credit: Gabriel Pérez Díaz (IAC)

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