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Galilean satellites

Syllabification: Gal·i·le·an sat·el·lites
Astronomy

Definition of Galilean satellites in English:

The four largest moons 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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Word of the day vigesimal
Pronunciation: ˌvīˈjesəm(ə)l
adjective
relating to or based on the number twenty