disc in the event that either spacecraft is ever found by intelligent life-forms from other planetary systems. The discs carry photos of the Earth and its lifeforms, a range of scientific information, spoken greetings from the people (e.g. the Secretary-General of the United Nations and the President of the United States, and the children of the Planet Earth) and a medley, "Sounds of Earth", that includes the sounds of whales, a baby crying, waves breaking on a shore, and a collection of music, including works by Wolfgang Amadeus Mozart, Blind Willie Johnson, Chuck Berry's "Johnny B. Goode", Valya Balkanska and other Eastern and Western classics and ethnic performers. (see also Music in space) See also Family Portrait The Farthest, a 2017 documentary on the Voyager program. List of artificial objects leaving the Solar System List of missions to the outer planets New Horizons Pioneer 10 Pioneer 11 Timeline of artificial satellites and space probes Voyager 1 Notes References Further reading Nardo, Don (2002). Neptune. Thomson Gale. JPL Voyager Telecom Manual External links NASA Voyager website Voyager 2 Mission Profile by NASA's Solar System Exploration Voyager 2 (NSSDC Master Catalog) 1977 in spaceflight 1977 in the United States 1977 robots August 1977 events in the United States Individual space vehicles Missions to Jupiter Missions to Neptune Missions to Saturn Missions to Uranus NASA space probes Nuclear-powered robots Radio frequency propagation Spacecraft escaping the Solar System Spacecraft launched by Titan rockets Spacecraft launched in 1977