This still image shows NASA's Voyager 1 spacecraft in 2012 exploring a new region in our solar system called the "magnetic highway." Voyager was launched from Cape Canaveral, Fla., on Aug. 20, 1977. (one of two launched in 1977) bound for Jupiter and Saturn. (The two Voyager space probes are still transmitting data.) Credit: NASA/JPL-Caltech)
