Oscillations of solar neutrinos could provide valuable information on the internal structure of the Earth, according to a new study. Ara Ioannisian of the Yerevan Physics Institute in Armenia and colleagues argue that the relative number of νe events detected during the day compared to those collected at night could be affected by the layer-like structure of Earth’s density, allowing a tomographic scan of the Earth’s interior. Specifically, the team studied the possibilities with the future long-baseline DUNE experiment in the US, which expects to see around 75 neutrino events per day in a 40 kt-active mass detector. Five years of data should, in addition to establishing the day–night asymmetry to a level of six standard deviations and providing valuable information on the squared mass difference between the lightest neutrinos, provide confirmation of the layer model of the Earth.