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Definition of Galilean moons in English: Galilean moonsproper noun Astronomy The four largest satellites of Jupiter (Callisto, Europa, Ganymede, and Io), discovered by Galileo in 1610 and independently by the German astronomer Simon Marius (1573–1624).
Definition of Galilean moons in US English: Galilean moonsproper noun Astronomy The four largest satellites of Jupiter (Callisto, Europa, Ganymede, and Io), discovered by Galileo in 1610 and independently by the German astronomer Simon Marius (1573–1624).
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