Girdled by its mighty rings, Saturn is the most recognizable yet least understood of the plants. Seven years after leaving Earth, Cassini, the most sophisticated planetary explorer ever built, arrives at Saturn for a four-year orbital mission. The fate of the entire $3.5 billion expedition depends upon Mission Control being able to thread an unmanned spacecraft, traveling at 80,000 kilometers per hour, through a gap in the rings of Saturn without hitting even a speck of
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