Our universe

An introduction to the planet Earth, discussing its place in the solar system, movement in space, interior, surface features, atmosphere, weather, inhabitants, and moon.

Text and pictures describe the stars and constellations.

Text and pictures describe nebulae.

Text and pictures describe the moons of our solar system.

Text and photos describe various aspects of the Milky Way and other galaxies, such as the various types of galaxies, the ways they change, and how they are studied; also includes a glossary and list of Internet sites.

Text and pictures describe how people will live in space stations and on the moon and Mars.

Discusses the history of space exploration as well as future projects designed for exploring space.

Text and pictures describe asteroids, comets, and meteors, and how astronomers search for them.

An introduction to Pluto, describing its place in the solar system, its physical characteristics, its movement in space, and other facts about this outer planet.

An introduction to the bodies in the solar system, including the Sun, planets, asteroids, meteoroids, and comets.