Discover interesting information about the planet Pluto through a vast archive of photographs and scientific facts.

Learn fun facts and details about the atmosphere, geography, composition, and discovery of Pluto, a dwarf planet.

Until the discovery of Eris, Pluto was known as the largest Keiper belt object. This dwarf planet has replaced Pluto in size and is accompanied by a satellite that has been given the name Dysnomia. Learn about this distant world here...

The innovative resource examines images of the Sun, Moon, Pluto, and all eight planets in the Solar System. Learners calculate the diameter of each object and rank the objects in order of size. The activity has an interactive online...

This site describes the extended belt of small bodies residing just outside the orbit of Pluto, the Kuiper Belt.

Read about our solar system and its formation over 4.6 billion years ago. Find out about the planets, asteroids, meteors, satellites, and comets. More in-depth planet background can be accessed through links.

This is a biography page for the American astronomer and discoverer of Pluto, Clyde Tombaugh.

Read about some of the most important space discoveries in recent times.