When you're done, check out these links
- http://sciencenetlinks.com/interactives/moon/moon_challenge/moon_challenge.html
- https://phet.colorado.edu/sims/html/gravity-and-orbits/latest/gravity-and-orbits_en.html
- https://www.quia.com/cb/895987.html?AP_rand=365289081&playHTML=1
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