As if we didn't have enough trouble:
"Scientists think galactic mergers are one of the primary ways galaxies form. Like heated wax in a lava lamp, two small galaxies can come together to form one larger one, or a blob of gas and stars might pinch off during a particularly messy galactic smash-up and, over cosmic time, the result evolves into a diminutive dwarf galaxy."
"Our own Milky Way galaxy is expected to collide and merge with its neighbor Andromeda in a few billion years to form a large elliptical galaxy some scientists jokingly call "Milkomeda" or "Andromeda Way." When that occurs, a black hole merger similar to that of NGC 6420 could occur." [Source: Merging Black Holes Observed in New Detail]
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