Jupiter has three moons for which there is evidence of a global, subsurface ocean of liquid water, with the strongest evidence favoring an ocean on Europa.
The Galilean satellites are a group of Jupiter's four sizable moons. Europa is the smallest and second-closest to Jupiter of these four. Its 1560 kilometre radius makes it significantly smaller than the Moon. This size of object is anticipated to dissipate its interior heat in a relatively short amount of time. For comparison, the majority of lunar volcanism ended more than 3 billion years ago, while the final eruptions took place about a billion years ago. Therefore, we can naively assume that Europa is geologically extinct.
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