From the Astronomy Picture of the day here's a wonderful composite of the moon and M31, the Andromeda Galaxy by Adam Block and Tim Puckett.
Most folks don't realize the immense apparent size of this galaxy, i.e., how big it is on the sky! Note how much larger it is than the moon!
Sadly, this also points out that galaxies are simply dim. Really dim! We can barely see our own and we are inside of it. The same goes for more distant galaxies.
The space scapes with bright galaxies glowing in the sky or the space craft view port simply don't exist in real life.