Children's LiteratureThe books from "Isaac Asimov's 21st Century Library of the Universe" series are soundly written with plenty of clear scientific explanations and interesting facts, but they are not terribly exciting. Each book reads like the next, as they all progress through the history of scientific discoveries leading to what we know about the particularly celestial body today. The rigid formatting and repetitive writing is a disservice to their often-impressive content. For example, the fact that Saturn is the only planet that could float in water because of its low density is confusingly conveyed by an illustration of children on the beach watching the planet skim the surface of the ocean. The book fares much better with its pictures, particularly the spectacular views of Saturn's rings and moons. This book is essentially a collection of wonderful facts without a coherent view of how to understand the night sky. 2004 (orig. 1988), Gareth Stevens Publishing, Ages 6 to 10.