VII. References and Other Resources
For additional activities using the Hubble Deep Field, see "Galaxies Galore" on Amazing Space, http://amazing-space.stsci.edu/
For additional information on active galaxies, see the Active Galaxy articles on Imagine the Universe!, http://imagine.gsfc.nasa.gov/docs/science/know_l1/active_galaxies.html
Planispheres may be purchased at any planetarium and many science museum shops. To make your own planisphere, see http://www.washjeff.edu/physics/plan.html.
The galaxy images used in this booklet are from the Digital Sky Survey, as cataloged on the Interactive NGC Catalog Online
For other discussions of rotation curves and the evidence for dark matter, see
For additional discussion of dark matter, see
An excellent guide to observing the night sky with a small telescope is "Turn Left at Orion: A Hundred Night Sky Objects to See in a Small Telescope - And How to Find Them," by Dan M. Davis, Guy J. Consolmagno, Daniel M. Davis, Cambridge Univ Pr (Trd); ISBN:0521482119.