what do we mean by black hole? is it a galaxy?
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what do we mean by black hole? is it a galaxy?
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Astronomers are very confident that the Milky Way galaxy has a supermassive black hole at its center, 26,000 light-years from the Solar System, in a region called Sagittarius A* because: ... No known astronomical object other than a black hole can contain 4.1 million M ☉ in this volume of space.