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Scientists have figured out how the subsurface ocean on Jupiter's moon Europa may have formed and determined that this vast expanse of water may have been able to support microbial life in the past. Europa, with an ocean hidden beneath a thick shell of ice, long has been viewed as a potential habitat for extraterrestrial life in our solar system, alongside other candidates such as Mars and Saturn's moon Enceladus. The effect of tides caused by Europa's gravitational interactions with Jupiter - the solar system's largest planet - and two other large Jovian moons, Io and Ganymede, also may have played a role.
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