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Today in History: NASA discovers Earth-sized exoplanet in habitable zone

4/17/2026

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Story summary

On April 17, 2014, NASA announced the discovery of Kepler-186f, the first Earth-sized exoplanet located in the habitable zone of another star. This significant finding, made by the Kepler space telescope, suggests that Kepler-186f may have conditions suitable for liquid water, raising hopes for the potential of life beyond our solar system.

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Story summary

On April 17, 2014, NASA announced the discovery of Kepler-186f, the first Earth-sized exoplanet located in the habitable zone of another star. This significant finding, made by the Kepler space telescope, suggests that Kepler-186f may have conditions suitable for liquid water, raising hopes for the potential of life beyond our solar system.