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In Kepler, NASA has an exoplanet hunter. In the Curiosity rover, the space agency has finely tuned mechanism for tracking down geological signs of past life on Mars. It even has an asteroid hunter capable of chasing down hurtling chunks of rock from millions of miles away. Now, NASA wants a comet hunter. Literally. Video: To Hunt Comets, NASA is Building a Giant Harpoon Video: To Hunt Comets, NASA is Building a Giant Harpoon
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With Gravity's Help, Cassini Puts On a Saturn Spectacular