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VII. References and Other Resources

For additional activities using the Hubble Deep Field, see "Galaxies Galore" on Amazing Space,

For additional information on active galaxies, see the Active Galaxy articles on Imagine the Universe!,

Planispheres may be purchased at any planetarium and many science museum shops. To make your own planisphere, see

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.

Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

The Imagine Team
Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.

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