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Europa Clipper is already in space, travelling 1.8 billion miles toward Jupiter's moon Europa, where a subsurface ocean holds more water than every ocean on Earth combined — it arrives April 2030 to ask whether anything is alive inside - Space DailySpace Daily · Thu, 06 Aug 2026 15:30:00 GMTGanymede is a moon, yet it is larger than the planet Mercury, may contain more water than exists on Earth's surface, and even generates its own magnetic field, making it less like a conventional moon than a full-sized world that happens to orbit Jupiter. - Space DailySpace Daily · Sat, 01 Aug 2026 23:30:58 GMTGanymede - Encyclopedia BritannicaEncyclopedia Britannica · Fri, 31 Jul 2026 07:00:00 GMT