Why Doesn't the Moon Fall Down?

This "Ask an Astronomer" episode explains how orbits work.
[youtube]http://www.youtube.com/watch?v=RsFf9gl6lL8[/youtube]
[youtube]http://www.youtube.com/watch?v=RsFf9gl6lL8[/youtube]
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https://www.livephysics.com:80/forums/viewtopic.php?f=24&t=722