Voyager I and Voyager II were launched from Cape Canaveral in 1977.Both spacecrafts carry a message—a greeting of sorts—from Earth to any form of life that may be encountered. The message is on a phonograph record (a 12-inch gold-plated copper disk) containing sounds and images portraying the diversity of life and cultures on Earth.
Dr. Carl Sagan and his associates assembled 115 images and a various natural sounds. They added music from different cultures and eras, and spoken greetings from Earth-people in fifty-five languages.
Between them, Voyager I and II have explored every one of the giant planets in our outer solar system: Jupiter, Saturn, Uranus and Neptune. It also explored 48 of their moons and the magnetic fields of those planets.
During September 2013, Voyager I was 18.7 billion kilometers from the sun, while Voyager II was 15.3 billion kilometers away from it., makingVoyager I the most distant human-made object in space.Five science investigation teams are currently participating in the Interstellar Mission. Voyager I is escaping the solar system at a speed of about 3.6 AU per year. Voyager II is escaping the solar system at a speed of about 3.3 AU per year.
