Why Does the Moon Change?

Have you ever wondered why, some nights, the moon looks like a big, bright circle, and some nights it looks like a little sliver? Join Jessi and Squeaks to learn about how the moon's orbit changes the way we see it here on Earth!
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SOURCES:
http://moon.nasa.gov/about.cfm
http://starchild.gsfc.nasa.gov/docs/S...
http://montana.pbslearningmedia.org/r...
http://montana.pbslearningmedia.org/a...