I'm a fan of DK books.

They're simple. They're informative. They're cheap. If your child is too young to read, they're perfectly good read-aloud books.

What more can you ask for when stocking your kid's library?

This one is not my favorite, probably because neither niece has shown a real interest in space yet. However, it's well-written enough that *I* learned something from it.

If your kid is very into space, I would recommend this book. ( )