Supermassive black holes are found throughout our known universe, devouring stars and shaping galaxies. They are the giants of the universe, yet their paths to existence remains mysterious. What caused these behemoths reach their mindboggling size?

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About How the Universe Works:
With a cast of experts and eyepopping CGI, we're looking under the celestial hood to tell the greatest story of all the story of where we and everything else came from.

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