Sagittarius A: The Invisible Heart of the Milky Way*

At the very center of our galaxy lies Sagittarius A*, a supermassive black hole with a staggering mass equivalent to 4.3 million suns. Though it is completely invisible to direct observation, its immense gravity is undeniable. Astronomers detect its presence by tracking the stars that are forced to orbit it at insane, high speeds.
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