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Definition of a geostationary orbit with some accompanying calculations.
An elementary quiz based on the position and orbits of the planets.
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
Comprehensive site all about gravity , its effects and the history of our understanding of gravity.
Explore our solar system with this beautiful 3D interactive which shows the orbits of the planets, distances, etc (requires flash).
Site to support the NEAR mission, sending a space probe to orbit 433Eros.
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.
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