6. Milky Way
The Milky Way is the galaxy where we can find our own solar system. It is termed the Milky Way due to the dim light it emanates which makes it hard for us to see the individual stars included in our galaxy. From our viewpoint it looks like a band because we are looking from within the galaxy. The very center of the galaxy is speculated to be a supermassive black hole.
The largest galaxies in our known universe are listed in the second half of the 10 biggest galaxies in the universe.