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The Oldest Habitable Planet Has Been Discovered

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Two planets, Kapteyn B and C, and been discovered orbiting a star just 13 light years from Earth. One of these may be able to harbor alien life. Kapteyn B is a planet over five times the size of Earth, and orbits its home star once every 48 days. The other newly-discovered world is larger still, and a year there lasts for 121 Earth-days. The smaller planet, orbiting closer to its sun, is within the "habitable zone" of its star. Temperatures there could be right to allow liquid water to exist on its surface.

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