In situ measurements of Saturn's ionosphere show that it is dynamic and interacts with the rings. - Wahlund JE; Morooka MW; Hadid LZ; Persoon AM; Farrell WM; Gurnett DA; Hospodarsky G; Kurth WS; Ye SY; Andrews DJ; Edberg NJT; Eriksson AI; et al. (Science (New York, N.Y.), 2018)