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How do satellites stay up?
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The speed with which a satellite is launched helps to keep it in orbit. To stay up above the Earth, a satellite must be launched at a speed of about 8 km per second.

If the orbit is less than 200 km above the Earth, faint traces of air will gradually slow the satellite so it loses height and eventually crashes to the ground. Satellites that are much higher can stay up indefinitely.

Some satellites are placed in a geostationary orbit. This means that their speed exactly matches that of th read more...

Tags: orbit, earth

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Discuss : How do satellites stay up? ... on Forum


Category: Astrology

Date Added: 09 Dec '11


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