NASA spacecraft exploring solar system’s edge (AP)

FILE - This undated file artist's rendering shows one of NASA's twin Voyager and Voyager 2 spacecrafts.  More than three decades after launching, NASA's workhorse spacecraft is inching closer to leaving the solar system behind. Currently 11 billion miles away from the sun, Voyager 1 has been exploring the fringes of the solar system since 2004. Scientists said Monday, Dec. 5, 2011,  the spacecraft has entered a new region in the solar system that they have dubbed the 'stagnation zone.'(AP Photo/NASA, File)AP - More than three decades after launching, NASA’s workhorse spacecraft is inching closer to leaving the solar system behind.

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