Final answer:
Black holes potentially exist in the Milky Way galaxy, with a supermassive black hole at the center and a range of sizes based on theoretical grounds.
Explanation:
Black holes potentially exist in the Milky Way as supported by the presence of a supermassive black hole at the center of our galaxy with a mass of approximately 4 million solar masses. Based on theoretical grounds, black holes in the universe can range in sizes from a few solar masses to a few tens of solar masses.
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