Voyager 2 was first to be launched from Cape Canaveral , Florida , on August 20, 1977 and Voyager 1, having a mass of 2100 kilograms at launch, was launched on a faster, shorter launch route on September 5, 1977 . Both spacecraft were launched from Titan-Centaur expendable rockets.
Voyager 1 was closest to Jupiter on March 5, 1979 , and Voyager 2 on July 9, 1979 .
The Voyager 1 and 2 Saturn flybys happened at a gap of nine months, first on November 12 and second on August 25, 1981 .
Voyager 1's flight path at Saturn bent it up and away from the ecliptic, the plane in which most planets orbit the Sun. Voyager 2 continued on for two more planetary encounters. Voyager 2 flew past Uranus on January 24, 1986 , and Neptune on August 25, 1989 . At the time, Neptune was the farthest planet of the solar system from the Sun. (Pluto once again became most distant in 1999.)
At present, the twin spacecrafts are heading out of the solar system. Flight controllers believe that both the spacecrafts will continue to work and send back valuable data at least till the year 2020. On February 17, 1998 , Voyager 1 passed the Pioneer 10 spacecraft to become the most distant human-made object in space.