At the center of the Milky Way galaxy lies a supermassive black hole known as Sagittarius A* (pronounced "Sagittarius A-star"). This black hole has a mass estimated to be about 4 million times that of the Sun. Surrounding this central black hole are dense clusters of stars, gas, and other astronomical phenomena, making the galactic center a region of intense activity and complex dynamics. Observations of stars orbiting near Sagittarius A* have provided strong evidence for the existence of this black hole.
. What is at the center of the Milky Way galaxy?
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