Oceans in other planets, more common than you could think: NASA study
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According to the latest study by NASA, there are more oceans in the alien planets than commonly believed. There are several moons of Jupiter, Saturn and other planets, water can be found and with a new generation of Telescopes, it will become easier to spot these oceans. The telescopes will start working in the next few years, confirming these findings. Scientists believe many planets have subsurface oceans.