Why do we think a moon called Europa hold clues to alien life?

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Bill Nye, The Science Guy: "Wherever there's an ocean, it's reasonable that there are living things"

The search for life on other planets has long inspired science fiction novelists and Nasa missions but could one of Jupiter's moons, Europa, provide proof? Bill Nye of the US Planetary Society - also known as The Science Guy - is among those who believe it is worth finding out. He is hoping to persuade Congress to spend $2bn exploring Europa.