The remarkable Exoplanet discoveries made by the Kepler and K2 missions have enabled astronomers to begin to piece together the history of the Earth and to understand how and why it differs from its diverse exoplanetary cousins. An image of Neptune taken by the Voyager spacecraft compared with an artist's conception of the exoplanet K2-263b [Credit: NASA; exoplanetkyoto.org]Two still outstanding puzzles include the differences...

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