Discusses the nine known planets of our solar system, their characteristics, and movements, as well as the possibilities of other undiscovered planets and extraterrestrial life.
Discusses kinds of space, the sky in outer space, time in outer space, weightlessness, survival in space, uses of space, mining the asteroids, and the end of space.
Discusses the various theories concerning the creation, expansion, and possible end of the universe. Also defines such phenomena as black holes, neutrons, pulsars, red shifts, and other discoveries that further enhance our knowledge of the world beyond our planet.