Journey Into Space: Gravity, Orbits, and Collisions
Space Astronomy and Space
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Moon Flip-Book

The Moon is like a giant bike reflector in the sky, shining back light from the Sun. Sometimes you can see the whole reflector and other times just a thin wedge of it. To find out why, fill in a Moon Watch Log and turn it into a flip-book.

http://ology.amnh.org/astronomy/stufftodo/moon.html
   
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