Find out about the four planets farthest from the Sun: Jupiter, Saturn, Uranus, and Neptune. Discover why these planets are called the gas giants, which spacecraft have visited them, and what lies beyond them in the solar system.
year: 2017
call number/section: 523.4
subjects: outer planets, planets, planetary science, dwarf planets, asteroids, solar system, jupiter (planet), saturn (planet), neptune (planet), uranus (planet)