This is a mini-book I made for my Space Unit in Science class about the Solar System.
I print and copy the pages, and also copy the lined paper (included in PDF) onto the back of each page.
The students cut along the dotted lines and assemble the pages in order. I go around and staple the books together.
Then, after the students have assembled the books, we copy interesting facts about the planets/sun/moon/etc onto the back of each page. You're on your own with the facts, though. I like space-facts.com; it has some very good information about all the planets and other bodies in the Solar System that you can choose and level for your kids.