Credits:

• The "Professor Astronomy" logo was inspired heavily by the "Bad Astronomy" logo of Phil Plait, http://www.badastronomy.com. The font was obtained from FontFreak, and is the "Fedora" font contributed by the ShyFonts Type Foundry. The image is a Hubble Space Telescope image of Abell 2218, a cluster of galaxies lensing several background galaxies.
• The image of Saturn used in bulleted lists is from the Voyager 2 spaceprobe and comes courtesey NASA/JPL-Caltech.

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This material is based upon work supported by the National Science Foundation under Grant No. AST-0602288. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).