Have you ever wondered…
Come along on a journey with Isaac Asimov to discover scientists’ answers to these and other questions about our Universe, the Sun, the Solar System, and the rocky planets--[sic] Mercury, Venus, Earth, and Mars. The fascinating photographs and illustrations will make this one journey you won’t forget!
This is a very nice overview of the solar system for young readers. (There are also books in the “Isaac Asimov’s Library of the Universe” series on each of the planets individually, the sun, the asteroids, and the riffraff.) Older readers would probably enjoy something like Asimov’s New Guide to Science a bit more, however.