Four galaxies collide. Pic from here via Oliver Willis.
*The Milky Way - the galaxy in which Earth and the Solar System is in a relative backwater - holds hundreds of millions of stars and is about a hundred thousand light years in diameter. It is home to at least one intelligent, advanced civilization (though that's a judgment call in my book). In four galaxies, there have to be two or three, unless you're of the belief that God created all this vastness just for us ... you know, the ones in the backwater of the Milky Way.
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