2017 marks the 40th anniversary of the Voyager mission as the twin space probes that traveled to Jupiter, Saturn, Uranus, and Neptune, now journey beyond our solar system into interstellar space, where no probe has ventured before.

Learn the fascinating story of the scientists, how the Voyager probes work, where the probes have been and what they’ve seen, and what they carry on board—including the Golden Record, a recording of sounds and images about life on Earth.

Critically acclaimed science writer Alexandra Siy chronicles the ongoing saga of the Voyagers in a lively story full of nail-biting moments, inspiring scientists, and incredible NASA images.