August 20, 1977 - Voyager 2

Thirty-four years after launch, Voyager 2 continues to explore
1977 - Earth
1979 - Jupiter
1981 - Saturn
1986 - Uranus
1989 - Neptune
2007 - Termination shock
2015 - Heliopause, the end of the Solar System
On August 20, 1977, the intrepid spacecraft Voyager 2 launched from the Cape Canaveral Air Force Station, FL on what was supposed to be only a four year mission to Jupiter and Saturn. But exactly 34 years later, Voyager 2 has cemented itself into the upper echelons of unmanned space exploration, continuing to beam back data as it searches for the barrier between our solar system and interstellar space.
1977 - Earth
1979 - Jupiter
1981 - Saturn
1986 - Uranus
1989 - Neptune
2007 - Termination shock
2015 - Heliopause, the end of the Solar System