Color photos and diagrams fill this overview of Uranus, Neptune, and Pluto, which describes their features, formation, moons and rings, and the history of research on them. Also includes a glossary and further-reading list.

Where are the outer planets?-- First view -- Getting closer -- Close encounter -- Uranus's rings -- Landing on Miranda -- The major moons -- Neptune -- Moons and rings -- Touchdown on Triton -- Inside Neptune and Uranus -- How Uranus and Neptune formed -- Pluto and Charon -- A day on Pluto -- Discovery and sightings -- Pluto and Planet X -- Probes to the outer planets -- Could humans live there?