Europa is tidally locked, so the same hemisphere forever faces Jupiter while the far side stares into deep space — a slow dance forced by the giant’s gravity over geologic time.
That lock couples with orbital resonances among Io, Europa, and Ganymede to flex Europa’s interior. The same face always leading simplifies maps of which terrain sits under Jupiter’s pull.
Tidal locking turns moons into one-sided neighbors. Europa shows planetary companions can live as fixed partners, not freely spinning twins of Earth.
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