40 years ago, on September 5, 1977, Voyager 1 launched from Florida, Earth, to begin a grand planetary tour of the solar system, taking spectacular pictures and measurements of Jupiter, Saturn, Uranus, and Neptune and then, spectacularly, being the first human made object to leave our solar system and officially enter interstellar space. Kevin and Jimmy talked to Ed Stone, a scientist who shaped the path of Voyager 1 and 2, about their historic discoveries over the last four decades.
