Most, if not all, galaxies have a supermassive black hole at their centers.
The black hole at the heart of Andromeda is believed to be ten times that size. Lying at the center of our galaxy is a giant black hole more than three million times as massive as the Sun. With every hour that passes, the Milky Way galaxy gets half a million kilometers closer to another sizable spiral galaxy called Andromeda, and it is only a matter of time before we collide. Two billion years from now our galaxy is in for a shock.
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