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Like Luke Skywalker's planet "Tatooine" in Star Wars, Kepler-18b orbits a pair of stars. Depicted as an extraterrestrial planet, Kepler-18b might also be a gas giant like Saturn. Prospects for life on this unusual world aren't good, as it has a temperature similar to that of dry ice. But the discovery indicates that the movie's iconic double-sunset is anything but science fiction.