There's a rogue supermassive black hole speeding through space at around five million miles per hour.
Usually, every galaxy contains a black hole, but this one has been kicked out of its home galaxy, 3C 186. This is probably the result of two galaxies colliding, which may have united both black holes. Astronomers predict that in 20 million years, it will break out of its galaxy and roam the universe forever.
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