Our 7.5 year old just eats up anything and everything on space. As you can imagine, there is a lot of content online, but in trying to reduce screen time, we wanted to find a good book and boy did we ever find one. This book is fantastic! The artwork, the details, the information, the facts, etc., are all top-notch and well thought out. Our son uses this book consistently and will probably use it forever as a form of reference. I cannot recommend this enough!