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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".
Giant balloon are planned to hoist satellites almost into space at a tiny fraction of the cost.
Simulation showing orbit, velocity and eccentricity of an Earth satellite.
Two spy satellites were donated to NASA that are as good as the Hubble
Information about satellites (Man-made). Build your own satellite on screen.
A collection of images of the planets and their satellites taken by NASA space missions.
More information on GPS including what type of information is transmitted by satellites.
A collection of links to sites tracking satellites, from the Hubble telescope to the International Space Station.
Computer generated images of the earth from satellites showing various data such as the location of icebergs and natural disasters.
News about the latest discoveries using satellites launched by NASA e.g. The Microwave Anisotropy Probe and the Compton Gamma Ray Observatory. This is all very up-to-date information on space-based ...
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