We're done with astronomy! My boys loved this book. They have looked through it over and over and over again. The pictures are amazing - bright, clear, interesting. It was a bit boring to read aloud, but they sat through about 4 pages a day. I think this serves best as a visual reference, not as a main text. My older boys (who can read) were able to read this and understand it on their own. I'm not the biggest fan of encyclopedia type books (too busy and not enough information) but for this topic I think this book was a positive addition. We'll most likely keep the book, and continue to use it as something nice to look at and fun to read for tidbits of information.