Our 'Message in a Bottle': Why NASA sent humanity’s life story into the deep, lonely reaches of space.

In 1977, NASA placed a gold-plated copper record on each Voyager; it carries 115 images, greetings in 55 languages, and instructions for playing it. Carl Sagan led the team that picked sounds and music for this cosmic mixtape. The record remains a unique message from Earth traveling through deep space.