This artist???s impression shows the planet K2-18b, its host star and an accompanying planet in this system. K2-18b is now the only super-Earth exoplanet known to host both water and temperatures that could support life.

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K2-18b is now the only super-Earth exoplanet known to host both water and temperatures that could support life. (Photo: ESA/Hubble, M. Kornmesser)This artist’s impression shows the planet K2-18b, its host star and an accompanying planet in this system.

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