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Essay/Term paper: Statlites

Essay, term paper, research paper:  Business

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Satellites orbit the earth doing our bidding in ways

that enrich the lives of almost all of us.

Through electronic eyes from hundreds of miles overhead, they

lead prospectors to mineral deposits invisble on earth's surface.

Relaying communications at the speed of light, they shrink the planet

until its most distant people are only a split second apart.

They beam world weather to our living room TV and guide ships

through storms. Swooping low over areas of possible hostility, spies

in the sky maintain a surveillance that helps keep peace in a

volatile world.

How many objects, exaclty, are orbiting out there?

Today's count is 4,914.

The satellites begin with a launch, which in the U.S. takes place at

Cape Canaveral in Florida, NASA's Wallops Flight Center in Virginia,

or, for polar orbiters, Vandenberg Air Force Base in California.

One satellite in 20 is crippled by the jolt of lift-off, or dies

in the inferno of a defective rocket blast, or is thrust into

improper orbit. A few simply vanish into the immensity of space.

When a satellite emerges from the rocket's protective shroud,

radiotelemety regularly reports on its health to round-the-clock

crews of ground controllers. They watch over the temperatures and

voltages of the craft's electronic nervous system and other

vital "organs", always critical with machines whose sunward side may

be 300 degress hotter than the shaded part.

Once a satellite achieves orbit--that delicate condition in which

the pull of earth's gravity is matched by the outward fling of the



crafts speed--subtle pressures make it go astray. Solar flares

make the satellite go out of orbit. Wisps of outer atmosphere drag

its speed. Like strands of spiderweb, gravity feilds of the earth,

moon, and sun tug at the orbiting spacefarer. Even the sunshine's

soft caress exerts a gentle nudge.

Should a satellite begin to wander, ground crews fire small fuel jets

that steer it back on course. This is done sparingly, for exhaustion

of these gases ends a craft's useful career.

Under such stresses, many satellites last 2 years. When death is

only a second away, controllers may command the craft to jump into

a high orbit, so it will move up away from earth, keeping orbital

paths from becoming too cluttered. Others become ensnarled in the

gravity web; slowly they are drawn into gravitational that serve

as space graveyards.

A satellite for communications would really be a great antenna tower,

hundreds or even thousands of miles above the earth, capable of

transmitting messages almost instantaneously across the oceans and

continents.

Soon after the launch of ATWS-6, "the Teacher in the sky", (a satellite

designed to aid people) NASA ground controllers trained its antenna on

Appalachia. There is brought evening college classes to schoolteachers

whose isolation denied opportunity for advancement.

The use of Satellites is growing rapidly and so is the different

jobs for them.










 

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