The following books were found at our local library and used to complete our project.
by Clifford A. Pickover
by Harry L. Shipman
edited by Kip S. Thorne, Richard H. Price, and Douglas A. Macdonald
by Clark R. Chapman and David Morrison
by Thomas T. Arny
by The World Book Encyclopedia of Science
by David Baker
by Matt Shobe and Tim Ritchey
by Merriam-Webster
by Steven J. Hynes
by Robert Jastrow
by Ian Ridpath and Wil Tirion