Caption Cross-section of the Earth (left) and the exoplanet Kepler-138 d (right). Like the Earth, this exoplanet has an interior composed of metals and rocks (brown portion), but Kepler-138 d also ...

Cross-section of the Earth's interior: crust, upper- and lower-mantle, and outer- and inner-cores. Journalists may use this image only with appropriate credit.

The cross-section entered the fit through the energy- and zenith-angle-dependent probability for the neutrinos to be absorbed as they pass through the Earth. This absorption probability depends on ...