On Aug. 20, 1977, Voyager 2 began an adventure that would lead it to interstellar space. The NASA-built craft would cross paths with the giants Saturn and Jupiter — catching glimpse of the first-ever observed volcanic activity outside of Earth, and eventually become the only spacecraft to visit Uranus and Neptune.
Like its sibbling, Voyager 1, the spacecraft is also an ambassador. It carries a 12-inch copper record of greetings in dozens of languages, samples of music and sounds both man-made and natural. To mark the spacecraft's incredible 37-year journey so far, enjoy this gallery of some of the best images it returned on its voyage away from our Solar System.