Cassini, the plutonium-powered cornerstone of a long-running joint mission by NASA and the European and Italian space agencies to distant Saturn, may help to extend the search for habitable environments in the outer Solar System with its Oct. 28 low-altitude dive through the curtain-like ice spray rising from the south pole region of Enceladus. The snowball of a moon shows strong signs of a global liquid ocean, internal heat source and organics—the key players responsible for ...

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