Why Doesn't the Moon Fall Down?
Posted: July 10th, 2007, 2:00 pm
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]