I read in my recent copy of Astronomy magazine that Hubble was the first to determine that Andromeda was not merely a Nebula, but a full galaxy on its own.
My question is, Why did it take so long? Why wasn't this realized sooner?
Now I know that technology hos obviously increased, but I figured that by the 30's (or so) the astronomers at least could have got photos to show that Andromeda was a galaxy
Note: I do know that he deduced this using Cepheid variables and I understand the basic mechanics of it, I'm just surprised that it took so long.
Note 2: Can someone explain how an astronomer can resolve a single star out of an entire galaxy?
I LOVE this stuff!