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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“Until they saw, over the mists
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from the belly of the sea.
And from the planet park
they heard the new fruit drop.”
—Anne Sexton (1928–1974)
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