A reference book is too wonky. A book with illustrations can be too kid-ish. If it looks too much like a Nat Geo books those who are immune to its charms will run like a vampire nearing daylight. Is there a cartoon in it? The middle school kids who see anything remotely associated with elementary school will tune out. Our Cosmos: The Complete Guide to Space for Kids is built for some of those upper-elementary ages. Those who will get the most out of the book are middle school kids who are curious about space, but might just be a little reluctant in learning about it.
Space, the cosmos by another name, can be fun to learn about

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