In ancient times only five planets were known: Mercury, Venus, Mars, Jupiter, and Saturn. Learn about Greek astronomer Ptolemy's theory for the solar system that was to survive for fourteen centuries.

This survey of the planets includes all the basics, size, mass, atmosphere, length of day, and the like. It features interactive activities and learning exercises and compares all of the planets in colorful tables.

Enter our solar system to interact with the planets, moons, asteroids, meteors, and more. Investigate with NASA scientists and explore missions related to space exploration. Read facts, compare statistics, look through resources, and...

This article from the Windows to the Universe gives information on Mayan myths related to the Earth, rain, the Moon, Venus, Mars, and the Milky Way. There are illustrations and explanations of vocabulary. Choose from beginner to advanced...

A detailed overview of the history, mythology, and current scientific knowledge of each of the planets and moons in the solar system.