Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
Really good book. My kid liked the bit about the astronauts, but the rings of Saturn and stuff like that were a bit beyond his understanding right now... he's 3. Maybe we'll introduce it to him again in a few months.
Baby enjoys reading this book. Very colorful and appropriate size for the baby to thumb through the pages. Informative as well. We made songs about the solar system as we read through the book to make it more fun.