Previous estimates have ranged from half a mile to tens of miles, highlighting how much there’s still to learn about Jupiter’s icy moon. The estimated thickness of the shell could also have major implications for future efforts to study Europa’s habitability. “How thick the ice shell is and the existence of cracks or pores within the ice shell are part of the complex puzzle for understanding Europa’s potential habitability,” said Juno principal investigator and Southwest Research Institute scientist Scott Bolton in the statement. The Europa Clipper is expected to arrive at Jupiter in 2030, and will then attempt to conduct almost 50 flybys of Europa. More on Europa: Scientists Intrigued by Large Spider-Like Blob on Europa