Voyager 1 was launched on September 5, 1977 (notably after Voyager 2 was launched!). The idea for it (a "grand tour" of the planets due to a particular orbital

Voyager 1 was launched on September 5, 1977 (notably after Voyager 2 was launched!). The idea for it (a "grand tour" of the planets due to a particular orbital alignment that made such a thing ideal) was hatched in the 1960s...