Explanation of Voyager spacecraft record. Diagram explaining the images and symbols engraved on the Golden Records carried by Voyagers 1 and 2. It was intended as a greeting to any intelligent life that may find them in the future and gives audio and visual information about Earth and its people. At upper left are details of how to play the record to listen to the sounds, with information on viewing the images at right. The circle in the rectangle is the first image, so aliens will know their interpretation is correct. The lines at lower left show Earth's position relative to 14 pulsars. The 2 circles at lower right represent the hydrogen atom. The Voyagers were launched in 1977, and will reach nearby stars in 40,000 years.