Review of Active Moons: Io, Europa, Enceladus, Triton, and Exomoons

This review chapter focuses on the outgassing signatures of active moons, including Io, Europa, Enceladus, Triton, and potential exomoons. Io, with its unique volcanic activity and plumes reaching hundreds of kilometers, serves as a model for potentially detectable Io-like exomoons. The icy moons Europa and Enceladus, with their subsurface oceans, are highlighted as the best candidates for harboring life, emphasizing the accessibility of subsurface oceanic material through plumes. Triton presents unique and unexplored questions regarding its activity. The review consolidates knowledge derived from both space- and ground-based observations to understand the origin and evolution of these active moons. It discusses moon formation in general before examining evidence and signatures of plumes. The accessibility of subsurface oceanic material through plumes opens possibilities for investigating biosignatures, making these moons high-priority targets for future exploration. The potential detection of Io-like exomoons with ground-based telescopes could significantly expand our understanding of moon formation and planetary system architectures. Further research is needed to understand the complex interplay between geological activity, subsurface oceans, and potential habitability on these active moons. This review underscores the importance of continued exploration and observation of these celestial bodies to advance our knowledge of planetary science and astrobiology.

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