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　　Isithumankind'sgreatestachievement?12billionmilesawayatinyspaceshipisleavingourSolarSystemandenteringthevoidofdeepspace.Itisthefirsthuman-madeobjectevertodoso.SlowlydyingwithinitsheartisaplutoniumgeneratorthatwillbeatforperhapsanotherdecadebeforethelightsonVoyagerfinallygoout.Butthislittlecraftwilltravelonformill...