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Galaxies
http://www.seds.org/messier/galaxy.html
- A description of the different classes of galaxies (spiral, elliptical, etc.), what kinds of objects galaxies contain, and when most galaxies were formed. High school and above.
http://www.damtp.cam.ac.uk/user/gr/public/gal_home.html
- Lots of interesting information on the Milky Way Galaxy, galaxy clusters, and how galaxies are related to dark matter. Intended for undergraduates, but still accessible for some high school students.
http://www.shodor.org/master/galaxsee/
- Software for computing simulations of galaxy formation, and motions of stars in galaxies. Also includes lesson plans for understanding how scientists detect black holes and what happens when galaxies collide. High school level.
Books
- Rosen, Sidney, Which Way to the Milkyway?, Carolrhoda Books, Inc.,1992. With cartoon characters leading the way, you'll find out much about our Milky Way and other galaxies in this question-and-answer book. Intended for students in elementary school.
- Gallagher, John S. and Sparke, Linda S., "Galaxies in the Universe: an Introduction," Cambridge University Press. Nov 2000. This text is intended for undergraduates with a major in astronomy or physics. Includes fundamentals of astrophysics, observations, and problems for the student to try.
- Waller, William H. and Hodge, Paul W., "Galaxies and the Cosmic Frontier," Harvard University Press. May 2003. A basic guide to the latest in galactic astronomy including galaxy formation, information on quasars, and the Big Bang. A good resource for astronomy enthusiasts, high school and above.