This book is part of a book series called I Wonder Why .

This book was published by Kingfisher .

Tony Kenyon was for many years an advertising art director in San Francisco and Hawaii. He is now concentrating on writing and illustrating picture books. He lives in Winchester. Chris Maynard is an editor and writer for several children's magazines. Carole Stott is an astronomer and author. She has written more than 20 books on space-related subjects for both adults and children.