Stars
A Star is a luminous heavenly body
that radiate energy. With naked eyes, we can see nearly 3000 stars in the night
sky and many more with the help of a telescope. The stars are remotely located
and appear as tiny dots of light. Their light travels long distances to reach
us. The atmosphere disturbances do not allow light to reach us in a straight
line path. Because of this the stars appear to twinkle. The Sun is the nearest
star to the Earth. The next nearest star is Alpha Centauri.
Satellites
An object that revolves around a
planet in a stable and consistent orbit is called a satellite. Satellites can
be classified into two categories – natural and artificial.
Natural
satellites
All natural objects revolving around
a planet are natural satellites. They are also called moons. Most moons are
spherical, the ones that are not usually asteroids or meteors that were
captured by the strong gravity of a planet. All planets except mercury and
Venus in our solar system have moons. Earth has only one moon- whereas planets
like Jupiter and Saturn have more than 60 moons.
Artificial
satellites
Artificial satellites are man-made
objects placed in an obit to rotate around a planet – usually the Earth. The
world’s first artificial satellite launched was Sputnik-1 by Russia, Aryabhatta
was the first satellite launched by India.
These satellites are used in television and radio transmission, studying agriculture yield, locating mineral resources, weather forecasting, locate different places on earth.
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