The Voyager 1 space probe was launched by NASA on September 5, 1977, to study the outer solar system and, ultimately, interstellar space. It carried a gold-plated audio-visual disc in the event that it might be found by intelligent life-forms from other planetary systems. The disc carried photos of the Earth and its life-forms, spoken greetings from people including the President of the United States, Jimmy Carter, and a medley of sounds from Earth, including whales, a baby crying, waves breaking on a shore and music, including works by Mozart and Chuck Berry's "Johnny B. Goode". It got picked up by two itinerant spacecombers from Morys Minor. The books in this series describe the ensuing story.