Both of the Voyagers were launched from Cape Canaveral in 1977 - with Voyager 2 actually the first to take off - taking advantage of a rare alignment (once every 176 years) of Jupiter, Saturn, Uranus and Neptune to shoot into interstellar space
Both of the spacecraft are powered by radioisotope thermoelectric generators (RTGs) - powered by the heat from decaying spheres of plutonium - although the output of these RTGs is decreasing by about four watts every year.
"If everything goes really well, maybe we can get the missions extended into the 2030s. It just depends on the power. That's the limiting point," said Linda Spilker, who started working on the Voyager missions before they launched