Andromeda is the nearest major galaxy to our own Milky Way Galaxy. Our Galaxy is thought to look much like Andromeda. Together these two galaxies dominate the Local Group of galaxies. The diffuse light from Andromeda is caused by the hundreds of billions of stars that compose it.
Click Photo To Enlarge NASA/courtesy of nasaimages.org
M81 Galaxy
M81 is one of the brightest galaxies that can be seen from the Earth.
Video: How Galaxies Grow And Evolve
This video explains current theories regarding how galaxies collide, grow and evolve. Includes dramatic photos taken by the Hubble Telescope.