More Cool Stuff

We obtained the above X-ray image of the Coma cluster from the homepage of NASA's High Energy Astrophysics Science Archive Research Center (HEASARC). Go to the HEASARC homepage, click on "HEASARC Images," then click on "ROSAT" in the table of high-energy astrophysics missions, and, finally, click on "Clusters of Galaxies":

http://heasarc.gsfc.nasa.gov

If, on the last page, you click on "ROSAT Mission Overview" instead of on "Clusters of Galaxies," you'll get to a description of the ROSAT spacecraft and mission:

http://heasarc.gsfc.nasa.gov/docs/rosat/rosat3.html

We found the above blue, red, and IR image of the Coma cluster on a page of the University of Toronto Astronomy Department:

http://www.astro.utoronto.ca/coma2.html

Check out the Kitt Peak National Observatory (KPNO). Go to the homepage of the National Optical Astronomy Observatory (NOAO) and click on "KPNO":

http://www.noao.edu/noao.html

For another image of the Coma cluster of galaxies, and one that shows a larger section of this cluster than the blue, red, and IR image above, go to a page of the University of Alabama, Department of Physics and Astronomy:

http://crux.astr.ua.edu/gifimages/coma.html

For a Primer on Dark Matter, go to a Web page brought to you by the University of Tennessee and the Oak Ridge National Laboratory:

http://csep1.phy.ornl.gov/guidry/violence/darkmatter.html