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"NASA says the Voyager 1 spacecraft has entered a region at the edge of the solar system, a final frontier it has to cross before reaching interstellar space."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2012/12/04/Voyager-1-poised-on-space-frontier/UPI-54581354658417/?spt=mps&or=2>