Galaxies have masses that range from 100,000 to 10 trillion times that of our own sun. There are millions and millions of galaxies within our universe. Recently, the Hubble Space Telescope was pointed to an area of space that in the past showed no visible galaxies or stars. The resulting picture showed this area to contain many more galaxies. This has caused astronomers to re-think the total number of galaxies in the universe.
Galaxies tend to be found in groupings throughout the universe.
Our local group of galaxies is made up of about 30 galaxies all within 2.5 million light years from our own Milky Way Galaxy. The Andromeda Galaxy is much like our own galaxy the Milky Way. Andromeda is about 2 million light years from Earth and the is most distant deep sky object visible with the naked eye. This makes Andromeda one of the best known deep sky objects. On a clear night under dark sky conditions, the Andromeda Galaxy appears as a small fuzzy oval to the naked eye.