Moon Phases HowStuffWorks

Moon Phases - Moon phases change throughout the month and are regular and highly predictable. Learn about moon phases and tides.
The moon is often the largest object in the sky outside of the sun. What is the moon made of, how did it form -- and why do people blame it for their strange behavior?

Models in textbooks and internet sources used to explain astronomy

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Moon Phases HowStuffWorks

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