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Communication satellites are most valuable when they stay above the same point on the earth, in what are called "geostationary orbits".
The precession of the orbits of inner planets, especially Mercury, cannot be accurately described by Newtonian theory but are in close agreement with general relativity.
Play with gravity in this fantastic simulator. Add stars and see how they move and orbit
Simulation showing orbit, velocity and eccentricity of an Earth satellite.
Comprehensive site all about gravity , its effects and the history of our understanding of gravity.
Site to support the NEAR mission, sending a space probe to orbit 433Eros.
Derivation of acceleration for a particle in a radial orbit in Schwarzchild geometry which, surprisingly, depends on its trajectory.
Explore our solar system with this beautiful 3D interactive which shows the orbits of the planets, distances, etc (requires flash).
Build your own solar system in this flash simulation with stars, planets and moons, and see what weird and wonderful orbits you can create.
Explore the stories of three exciting space missions: "Friendship 7" - John Glenn Orbits the Earth; "Apollo 11" - First Moon Landing and "STS-7" - First American Woman in Space.
Showing 11 - 20 of 38