Although the search for extraterrestrial life typically focuses on the potential habitability of newly discovered exoplanets, humanity's first contact might actually occur much closer to home. Unfortunately, while none of the Solar System's other planets have climates suitable for hosting life, there is compelling evidence that points to the moons of Jupiter and Saturn instead.  Combined, the gas giants Jupiter and Saturn have almost 150 confirmed moons, ranging from asteroidal, rocky objects to planet-sized, geologically complex worlds.  Hidden amongst the immense variety of lunar shapes, features, and environments, here are the best places to search for alien life in the Solar System:

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