|
|
| |
|
|
Satellites
|
 |
|
|
Imagine not being
able to see STAR Plus or MTV -
wouldn't life be a drag? Or perhaps not being able to listen to
the weather reports? How would we be able to predict
earthquakes and cyclones? We truly do have to thank the
satellite for making life so much easier and safer. There is no
limit to what satellites can do these days - from weather
reports to locating mineral deposits to navigating ships
and aeroplanes, to calling our cousins in America to allowing us
to see 'live' TV programmes, satellites are an
ingenious piece of technology!
There are
numerous satellites moving around the Earth right this moment,
serving different needs of different countries. They
are propelled into space via rockets and put on an 'orbit'.
An orbit is a path that a satellite will take around the
Earth, depending on its job. |
|
| |
|
There are
different types of orbits around the Earth of varying sizes and
each one is used for a particular objective, such as:
|
-
The
Eccentric orbit holds a satellite that measures the
Earth's magnetic and electric fields. This
orbit is conducive for this purpose, since the satellite can
obtain measurements at different distances from Earth.
-
The
Low Earth orbit is said to be the easiest to reach
and is where the Russian space station and Hubble
Space Telescope both orbit.
-
The
Polar orbit is, as its name suggests, concentrated
around the Earth's poles. Weather satellites
are placed here as readings of the entire Earth can be taken
while the planet spins.
-
The
Geostationary orbit is about 35, 880 km above the
Equator and holds communication satellites,
especially television satellites. Both the Earth and the
satellites complete their respective circles at the same time,
meaning they move neck-to-neck.

|
|
Once the
satellite is in orbit and working well, ground
stations track it. They monitor its readings and
condition, changing direction as and when needed. All
the data received is processed and sent to the scientists for
analysis. The receiving end of all this information
sent by the satellite is a large dish. Most of us have seen
the satellite television dishes, but the ones
at the ground stations are much larger and more sophisticated.
In case of
breakdown of the satellite, astronauts are sent out to space
to correct any problems. Any serious or larger faults call for
bringing back the satellite to the ground station on earth,
repairing it and then relaunching.
The use
of satellites has been a blessing in many ways and has
propelled technology in manners that could hardly have been
imagined. Europeans and Russians especially, have done
tremendous work in this field and continue to advance with
full speed. |
 |
|
|
|
|
|
|
|