PASADENA, California, Oct. 26 (TNSper) -- NASA's Jet Propulsion Laboratory issued the following news: * * * Stone's remarkable tenure on NASA's longest-operating mission spans decades of historic discoveries and firsts. * * * Edward Stone has retired as the project scientist for NASA's Voyager mission a half-century after taking on the role. Stone accepted scientific leadership of the historic mission in 1972, five years before the launch of its two spacecraft, Voyager 1 and Voyager 2. Under more PR