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November 3, 2011 6:59 AM

NASA astronauts train in Florida Keys for voyage to an asteroid

At 60 feet below the ocean’s surface, alongside coral, fish and a curious goliath grouper, NASA astronauts and scientists spent seven days testing battery-powered jet packs, booms with magnets, robotic arms on one-man subs and other ways to function in zero gravity. The Florida Keys underwater world is helping NASA prepare for humankind’s first trip to an asteroid.

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