Page 191 - Science Class 08
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v Sun-Synchronous Orbit Satellites : A India has also launched a series of INSAT
satellite is said to be in a sun-synchronous (Indian Na onal Satellites) for weather
orbit if its posi on, with respect to a monitoring.
par cular loca on on the earth always Remote Sensing
remains in tune with the posi on of the
Remote sensing satellites are used to get a
sun over that loca on. We can also say that
detailed descrip on of an object or an area of
such a satellite passes over a par cular
the earth. Therefore, we use remote sensing
loca on on the earth at almost the same
satellites for groundwater surveys, detec on
local me.
coal, oil or ore deposits, for forest surveys,
Applica on of Ar ficial Satellites detec on of fishing zones and so on. These
Ar ficial satellites can be used in communi- satellites are also used for military and spying
ca on, weather monitoring, taking idea of an purposes. India has also launched its remote
area on the earth and exploring our space. sensing satellites such as IRS - IA and IRS - IB.
Let’s discuss about some important applica- Applica ons of Space Science
ons of ar ficial satellites:
Apart from the ar ficial satellites, scien sts
Communica on : Ar ficial satellites have have also launched space probes to know more
brought a revolu on in communica on sector. about the planets and other heavenly bodies.
It is the contribu on of ar ficial satellites that We have come to know more about planets
enables us to have instantaneous communi- and other heavenly bodies through the
ca on around the globe. informa on collected by space probes. These
The satellites which are used in communica on space probes collect informa on about many
are geosta onary satellites. These satellites are nearby as well as very distant celes al objects.
fi ed with transponders that can receives
signals from a par cular transmi ng sta on on
the earth and then transmit them at different
loca ons on the earth. In this way, we get India is the first country which has launched
instantaneous picture and sound from a live ten satellites at the same me in April, 2008.
place.
Weather Monitoring : Ar ficial satellites are
also used by meteorological department for
1. What do you mean by a satellite?
the predic on of weather. Actually, ar ficial
satellites are fi ed with powerful cameras that 2. What is an ar ficial satellite?
keep records of the factors that influence 3. Differen ate between natural and man-
weather of a place. With the records given by made satellites.
these ar ficial satellites, the weather pa erns 4. Why does the moon change its shape
everyday?
and facts are observed by the meteorologists
on that basis they predict weather condi on in 5. What is geosta onary satellite?
advance. They can predict weather condi ons 6. What is the role of an ar ficial satellites
such as rain, storm, cyclones, floods, humidity in weather forecas ng?
and so on.
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