Over 12 billion miles from Earth, a gangly ship sails through interstellar space. It is, by far, the most distant object made by human hands. In 1977, NASA launched twin Voyager spacecraft. An emotional, cinematic documentary, The Farthest tells their story through first-hand accounts from the passionate men and women who built the ships and guided their journeys. Negotiating a series of perils on its Grand Tour of the outer planets, Voyager beamed back spectacular images of Jupiter, Saturn, Uranus, and Neptune. But their moons offered bigger surprises—volcanoes, geysers, and a liquid water ocean. On the chance of discovery by intelligent aliens, each spacecraft carried a Golden Record with music and spoken greetings. The mission has earned its place in the pantheon of human achievements. Long after our sun has flamed out, the Voyagers are likely to be sailing on, perhaps the only evidence that we ever existed.