An introduction to the two planets farthest from the Sun, Uranus and Neptune, including what they are made of, their features such as rings and moons, how scientists find out about these planets, and a description of Pluto and other dwarf planets.

The solar system -- Uranus -- Neptune -- Discovering Uranus and Neptune -- Rings and moons -- Exploring the outer solar system -- The dwarf planets -- Pluto -- Eris and Ceres.