Written in the style of a traveller's guide book, the authors take you on an interplanetary cruise describing each body in detail. The book runs from the largest (the Sun) to the smallest objects (comets and tiny asteroids) in the solar system. The illustrations are either photos from spacecraft that have visited the various planets and moons, or are hypothetical paintings based on what the surfaces may look like. One particularly striking painting is of the surface of Pluto, with the sun as a mere bright speck in the sky.
I'd recommend this book to anyone with a passing interest in astronomy or the planets, it's a great read and never gets obtusely technical. Ron Miller and William K. Hartmann are without a doubt the finest planetary artists around today.