Spacecraft and telescopic investigation of the other worlds of our solar system has not given any indication of a flourishing global biosphere like Earth's. Indeed, there is no another world with liquid water present on its surface. If there is other life in our solar system, it is not a global ecology but cryptic, subsurface life. Mars, the Jovian satellite Europa, and the Saturnian satellite Enceladus provide the most likely sites for present or past water and hence life.
Titan, the largest Saturnian satellite, has a liquid on its surface but it is methane, not water.
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