NASA extends Saturn mission

• Story Highlights
• Cassini mission, touring Saturn and its moons, extended for two years
  
• Unmanned probe beamed back 140,000 images since 2004
  
• Cassini to circle Saturn 60 more times and fly by its largest moon, Titan
  
• Extension costs $160 million; U.S. has invested $2.6 billion in mission
  
  
  
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