Messier 104 is commonly known as the Sombrero galaxy because in visible light, it resembles the broad-brimmed Mexican hat. However, in Spitzer's striking infrared view, the galaxy looks more like a "bull's eye.
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.