Our solar system hosts ~300 moons whose diversity challenges our understanding of planetary formation and evolution. Despite decades of research, many studies on the interior evolution and present-day conditions of Europa and Ganymede still assume that these moons formed hot with a metal-sulfide core, like Earth. In contrast, numerous formation models suggest that these moons accreted cold (a few hundred K), calling for a reevaluation of their long-term evolution. My presentation has three parts. First, I will introduce the “cold accretion” paradigm, where icy moons could form as cold mud balls and evolve slowly afterwards. Second, I will tour several of my collaborations motivated by Trinh et al. (2023). Topics include an ancient water ocean at Io, dynamos at the Galilean satellites, an ongoing dynamo at Triton, and dynamic habitability in Europa’s ocean. Third, I will discuss future projects for the next few years, as well as preparation for the upcoming fleet of spacecraft missions to icy moons in the coming decades.