Giant black holes at the centers of galaxies, with millions or even billions of times the mass of the Sun, surrounded by dust and gas that is heated to millions of degrees as it falls into the black hole.
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| Active Galactic Nuclei (AGN) Giant black holes at the centers of galaxies, with millions or even billions of times the mass of the Sun, surrounded by dust and gas that is heated to millions of degrees as it falls into the black hole.
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