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Nine Planets
The Nine Planets: The Moon
Explore the mythology, structure, observational history, gravitational force, and orbit of Earth's Moon.
PBS
Pbs Learning Media: Why Doesn't the Moon Fall Down?
In this animated video segment adapted from NASA, astronomer Doris Daou explains how the forces of speed and gravity keep the moon in a constant orbit around Earth. [1:36]
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Gravity and Orbits
An interactive simulation that teaches about gravitational force, circular motion, and astronomy by manipulating the sun, earth, moon, and a space station to observe the effects of gravity and orbital paths. This simulation can either be...