Describes the characteristics and movements of the planet Neptune and how we found out about it.

Briefly describes beliefs of astronomers from ancient times to 1609, when Galileo's discoveries through the telescope gave birth to modern astronomy.

One of the most gifted and prolific writers of the twentieth century shares his inner thoughts and experiences. Popular science and science fiction writer Asimov (1902-92) wrote a three-volume autobiography, but it is now out of print, along with most other accounts of his own life. His widow, also a writer, has collected and excerpted bits from various sources, including his letters to her, and arranged them by topic rather than chronologically....

Describes the planet closest to the sun, examining its size and composition, its surface features, its orbit, and efforts to learn more about this planet.

A brief discussion of 102 basic chemical elements introduces a more detailed account of the structure, forms, and uses of the most common elements.