Why Europa Stayed Wet While Io Dried Out: Tracing the Early Lives of Jupiter’s Inner Moons
The paper examines why Io is dry while Europa is water-rich, testing whether both moons formed as ocean worlds and later evolved differently. Using thermal and atmospheric escape models, the authors find Europa easily retains its water, while Io cannot lose a large primordial water inventory. They conclude Io likely formed from dry material, and the moons’ differences reflect where they formed in Jupiter’s disk.
Moon Mysteries: How Did Saturn’s Diverse Moon Family Come to Be?
Saturn’s fascinating family of moons showcases incredible diversity, from tiny "ring-moons" nestled within icy rings to Titan, its massive moon with a dense atmosphere. Blanc and colleagues explore theories of their formation, favoring a scenario where Saturn’s rings once extended far beyond their current limits, gradually spreading outwards and forming moons at their edges. Titan's unique characteristics, however, suggest a more complex formation history.