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Published on Dec 31, 2016
#HowTheUniverseWorks | Tuesdays at 10/9c on Science Full Episodes Streaming FREE on Science GO: https://www.sciencechannelgo.com/how-... In 4 billion years, the Milky Way and Andromeda galaxies will collide. When that happens, the black hole in the center of our galaxy will merge with another creating a supermassive black hole that will weigh 100 million solar masses.