NASA’s Kepler mission is specifically designed to search for habitable planets. Among the thousands of candidate planets found in the past few years is Kepler-22b, the first non-solar planet confirmed to orbits within the habitable zone of its star.
Let’s be clear about what this means. This does not mean that Kepler-22b contains life, or even that it could sustain life. All it means is that the planet orbits at the correct distance from its star so that liquid water could form on its surface. We don’t yet know if there’s any water actually there. In fact, we don’t even know whether the planet is rocky or gaseous, though at only 2.4 times the radius of the Earth, it could well have a solid surface.
This diagram compares our own solar system to Kepler-22, a star system containing the first "habitable zone" planet discovered by NASA's Kepler mission.
Image credit: NASA/Ames/JPL-Caltech
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