ESA on Friday launched its Juice spacecraft that's going to probe Jupiter's fascinating moons For more on the science and instruments involved, check out this mission overview feature by katyanna_q
Bunce wants to know why Ganymede is the only moon that has an internally driven magnetic field, and how deep and salty its oceans might be. The moon's magnetic field interacts with its host planet's field, and auroras are created in Ganymede's atmosphere.
Images of plumes of water vapor shooting from Europa's surface have been snapped by other spacecraft, and Juice will map any pools of liquid water underneath its icy surface. Callisto doesn't seem to be geologically active, and is tidally locked with Jupiter. Astronomers believe its surface hasn't changed much over time, meaning it could betray secrets as to how Jupiter's system and other similar gas giant systems formed.
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