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Water vapor found on the “habitable” exoplanet K2-18b is thrilling, but not earth twin

Astronomers are finding an increasingly heterogeneous world that can support life like Earth, but none of these extrasolar planets to this point is a carbon copy of our inhabited world. The latest thrilling discoveries involve K2-18b. K2-18b is a planet about 110 light-years away from Earth discovered by the NASA Kepler Area Telescope in 2015. …