Isaac Asimov

A description of the sun, the star of our solar system, which includes information on its origin, physical composition, and characteristics, as well as on studies made of the sun by instruments and satellites.

Earth is ruled by master-machines but the Three Laws of Robotics have been designed to ensure humans maintain the upper hand: 1) A robot may not injure a human being or allow a human being to come to harm 2) A robot must obey orders given to it by human beings except where such orders would conflict with the First Law. 3) A robot must protect its own existence as long as such protection does not conflict with the First or Second Law. But what happens...

Interplanetary intrigue, hyperspace pursuit, and future technology combine with a desperate search for the planet Earth.

The Galactic Empire declines, and a period of disruption ensues, followed by the emergence of the Foundation, creation of psychohistorian Hari Seldon, as a state strong enough to finally defeat the decrepit First Empire.

A space colony arrives at a planet only to find it is slated for destruction.

Discusses the formation and peculiar features of the universe, particularly stars and galaxies emitting special types of radio waves.

Examines the many facets and puzzles of our moon, including its phases and eclipses, its early discoveries and modern exploration, and its possible origins and future prospects.

Describes the characteristics of the small planet closest to the sun whose day is twice as long as its year.

Briefly discusses facts and fantasies about UFOs.