In August of 1977, the first of two identical robotic probes was launched from Cape Canaveral, Florida, bound for our outermost planets and beyond. Voyager 1 and Voyager 2 have each traveled more than 10 billion miles in the past 40 years, sending back invaluable observations and images. They discovered two dozen new moons, discovered active volcanoes on Jupiter’s moon Io, took a famous “family portrait” of our solar system, and much more. Voyager 1 recently became the first spacecraft to leave the heliosphere and enter interstellar space. The Voyagers are also famous for being our most remote emissaries, carrying with them identical “golden records” with images and sounds from Earth. On this 40th anniversary of the first launch, a look back at the still-running Voyager mission follows.