Illustration of Habitable-Zone Exoplanet (IMAGE)

NASA/Goddard Space Flight Center

Illustration of Habitable-Zone Exoplanet

Caption

An illustration of Kepler-186f, the first Earth-size planet discovered within a star's habitable zone. Scientists now know of thousands of exoplanets, but our knowledge is limited because we can't yet view them directly.

Credit

NASA Ames/SETI Institute/JPL-Caltech

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