A circumbinary planet is a planet that orbits two stars instead of one. Because of the close proximity and orbit of some binary stars, the only way for planets to form is by forming outside the orbit of the two stars. As of October 15, 2012, there are sixteen confirmed systems of circumbinary planets: PSR B1620-26, HW Virginis, Kepler-16, Kepler-34, Kepler-35, Kepler-38, Kepler-47, Ross 458, NY Virginis, UZ Fornacis, RR Caeli, HU Aquarii, DP Leonis, NN Serpentis, NSVS 14256825 and PH1.
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“Mad? Is it mad that you destroy other people to save yourselves? You have done this. Is it mad that one country must destroy another to save themselves? You have also done this. How then is it mad that one planet must destroy another who threatens their very existence?”
—Edward D. Wood, Jr. (1922–1978)