This book is part of a book series called Isaac Asimovs 21St Century Library Of the Universe .

This book has been graded for interest at 8-11 years.

There are 32 pages in this book. This book was published 2005 by Gareth Stevens Publishing .

Richard Hantula has written, edited, and translated books and articles on science and technology for more than three decades. He was the senior U. S. editor for the Macmillan Encyclopedia of Science.