Like HowStuffWorks on Facebook!

How Galaxies Work

Lots More Information

HowStuffWorks Articles

More Great Links


  • A Map of the Milky Way.
  • A Review of the Universe - Structures, Evolutions, Observations, and Theories.
  • A Teacher's Guide to the Universe.
  • Bennett, J et al. "The Cosmic Perspective (third edition)." Pearson, 2004.
  • Chandra X-ray Observatory - X-ray Astronomy Field Guide, Starburst Galaxies.
  • Galaxy Classification and Evolution Lab.
  • Henry, J. Patrick et al. "The Evolution of Galaxy Clusters." Scientific American, December 1998.
  • NASA Imagine the Universe, "The Hidden Lives of Galaxies" book.
  • NASA Imagine the Universe, Active Galaxies and Quasars.
  • NASA Imagine the Universe, The Hidden Lives of Galaxies poster.
  • NASA/JPL Galaxy Evolution Explorer (GALEX).
  • NASA/JPL GALEX. Galaxies and UV.
  • Science @NASA. What are Galaxies? How Do They Form and Evolve?
  •, Galaxies.
  • Seeds, MA. "Stars & Galaxies (second edition)." Brooks/Cole, 2001.
  • Stephens, S. "Galaxy Sorting Handout."
  • University of Washington Astronomy Department. Lecture" "Galaxies: Classification, Formation, and Evolution."
  • Windows to the Universe, Galaxies.­the_universe&edu=high&br=graphic&back=/pluto/pluto.html&cd=false&fr=f&tour=
  • WMAP Cosmology 101: What is the Universe Made of?