Discusses the characteristics of comets, asteroids, and meteoroids and describes what happens when one of these celestial objects passes close to or collides with the Earth.
Discusses the history of space travel from the earliest manned voyages to the first landing on the moon, and describes unmanned missions to other planets and possible space vehicles and flights of the future.
Discusses mysteries of outer space that scientists cannot explain completely, including the origin of the universe, the creation of galaxies, black holes, and the existence of life on other planets.