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.
Those are the first things I look for in space images. If you haven't seen it, go find the Webb deep field image that they released a month or two ago. It will blow your mind!
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.