A trio of researchers from CSIC-Universitat de València and Universitat de Barcelona has used data from the IceCube detector in Antarctica to measure Earth’s mass. In their paper published in the journal Nature Physics, Andrea Donini, Sergio Palomares-Ruiz and Jordi Salvado describe using data describing neutrinos passing through the Earth to learn more about the interior of the planet. Véronique Van Elewyck with Paris Diderot University has written a News and Views piece on the work done by the team in the same journal issue.