I also got thinking about this from APOD years ago. It's not just Andromeda that's visibly large (but too faint) to see, many famous nebulas are comparably big.

I also got thinking about this from APOD years ago. It's not just Andromeda that's visibly large (but too faint) to see, many famous nebulas are comparably big. The Orion nebula is over one degree across (The moon is about 1/2 degree). I'd love to a see a night sky full of all these at once and to imagine the mythologies that would have formed around them. A red-hued Mars became the god of war, what would Andromeda have been?