A study by Dr. Siegfried Eggl of NASA’s Jet Propulsion Laboratory and Dr. Max Popp of Princeton University and the Max Planck Institute of Meteorology has found that an Earth-like circumbinary planet could be habitable if it were located within a certain range from its host stars. This artist’s concept shows a hypothetical aquaplanet around the binary star system of Kepler-35. Image credit: NASA / JPL-Caltech. Planets that orbit two stars are...