In 1977, NASA launched Voyager 2, on a Titan-Centaur rocket. It was an unmanned spacecraft to explore the outer planets Jupiter, Saturn, Uranus and Neptune, where it also discovered and photographed many previously unknown moons, rings and other features of the planets. A 12-inch copper phonograph record carried on board contained greetings in dozens of languages, samples of music and sounds of nature. Voyager 1 was launched similarly one month later, on 5 Sep 1977.