Starry Messenger by Peter Sis
Book Review
Starry Messenger 
Ages 9 and up
Starry Messenger tells the story of Galileo, his astronomy discoveries, and his conflict with the Church. It's a beautiful and important book for kids interested in science. This is despite the flaws - reviewers have rightly criticized the book for formatting (much of the information is handwritten, sometimes in sideways or circular patterns - very hard to read) and for inaccuracy (Galileo's discoveries went against later-recanted Church teaching, not the Bible).
But I love this book anyway, because it uses art to add emotional impact to a science story, and because it includes quotes from primary historical sources, including Galileo's own writing. This is a book to be pored over and savored, which is why I've recommended the hardcover edition.