I bought this as a gift for a 5 year old. He absolutely loves it! He is just starting to learn about space and is very excited to learn more. He screamed at the top of his lungs when he opened this! I got a "great pick" from the dad. The short sentences are perfect for this little guy who is starting to read and recognizing small words. The length of the book is great because it's long enough to be a story but short enough to keep his attention to learn to read.