The debate of "do other galaxies even exist?" wasn't definitively settled until 1923, 99 years ago, with Edwin Hubble's observations of Cepheids in Andromeda.
Now, you can just, like, look at them. (With a good telescope.) Every single place you look.
The debate of "do other galaxies even exist?" wasn't definitively settled until 1923, 99 years ago, with Edwin Hubble's observations of Cepheids in Andromeda.
Now, you can just, like, look at them. (With a good telescope.) Every single place you look.