The weak magnetic field of Europa may originate from a rapidly rotating liquid iron core.
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Q15: All four of Jupiter's big moons, like
Q16: Alone of all the Galilean moons, Callisto
Q17: Besides Mars, exobiologists find Europa also a
Q18: The surface of Io looks most like
Q19: Due to tidal stresses, it is likely
Q21: Titan's surface has been mapped using Earth
Q22: The F- ring is held in place
Q23: The surface of Saturn's moon Enceladus is
Q24: Two sets of rings around Jovian planets
Q25: Probably the next satellite to get turned
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