e1-earth_and_kepler_138_d_interior_illustration

This illustration shows cross-sections of the Earth and the exoplanet Kepler-138d. Measurements of Kepler-138d’s density suggest it could have a water layer that makes up more than 50% of its volume, to a depth of about 1,243 miles (2,000 kilometers).

This illustration shows cross-sections of the Earth and the exoplanet Kepler-138d. Measurements of Kepler-138d’s density suggest it could have a water layer that makes up more than 50% of its volume, to a depth of about 1,243 miles (2,000 kilometers). Credit: Benoit Gougeon (University of Montreal)

This illustration shows cross-sections of the Earth and the exoplanet Kepler-138d. Measurements of Kepler-138d’s density suggest it could have a water layer that makes up more than 50% of its volume, to a depth of about 1,243 miles (2,000 kilometers).

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