This book is part of a book series called Dk Online .

This book has been graded for interest for readers up to 17 years.

There are 96 pages in this book. This book was published 2007 by DK Publishing (Dorling Kindersley) .

John Farndon has written many books for children, specialising in popular science and astronomy. He has twice been shortlisted for the "Copus Science Book Prize. "