TED Talks
Ted: Ted Ed: How Do We Study the Stars?
Yuan-Sen Ting takes us into deep space to show how astronomers study the stars beyond our reach. [4:46]
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...