NASA Voyager

December 5, 2011 - 4:11 PM
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)