More to Explore 217
Goldsmith, Donald. Worlds Unnumbered: The Search for Extrasolar Planets.
Sausalito, CA: University Science Books, 2000.
Halpren, Paul. The Quest for Alien Planets: Exploring Worlds Outside the Solar System. New York: Plenum, 1999.
Lemonick, Michael. Other Worlds: The Search for Life in the Universe. New York: Simon & Schuster, 2001.