Unfortunately, it's not that bright. But it's a beautiful simulation anyway, one that gives an idea—albeit a faint one—of how huge the cosmos is. Of course, it's not the only image of this kind. Here's another one featured in NASA's Astronomy Picture of the Day.
Andromeda—or M31—is larger than our Milky Way (although not as massive, if you count the dark matter in our galaxy.) It's 2.5 million light-years from us, while the Moon is only 384,400 kilometers away. Now think that a light-year is 9.5 trillion kilometers. Even with this graphic comparison, the size of M31—or anything at a galactic scale—is truly incomprehensible for the human mind.