UNIVERSE
What is Universe?
The universe is a huge wide
open space that hold everything from the smallest particle to the biggest galaxy.
No one knows just how big the Universe is. Astronomers try to measure it all
the time. The use a special instrument called spectroscope to tell whether an
object is moving away from Earth of towards the Earth. Scientist believe that
about 13.7 billion years ago, a powerful explosion called the Big Bang
happened. This powerful explosion set the universe in motion and this motion
continues even today. Scientists are not yet sure if the motion will stop, change
direction or keep going forever.
Parts of Universe:-
·
The Solar
System:
The Solar
System consists of sun, 8 planets and their satellites, asteroids, comets and
meteors.
·
Sun:
The sun is
a huge, glowing ball at the centre of our solar system. The sun provide light, heat
and other energy to earth. The sun made up entirely of gas.
·
Planets:
Our solar
system consist of sun, eight planets, moons etc. the sun is the centre of the
solar system. The planets are Mercury, Venus, Earht, Mars, Jupiter, Saturn,
Uranus and Neptune.
·
Natural Satellites:
An object
which revolves around a planet is called satellites. Our Earth's natural satellites is Moon.
·
Comets:
They are heavenly
object which revolve round the sun like planets but have a very long period of
revolution.
·
Meteors and
Meteorites:
Meteors are
small heavenly object moving round the sun. Sometimes, meteors of greater size
reach the Earth without getting brunt and then these are called meteorites.
·
Asteroids:
Asteroids are
small heavenly object that lies between the orbit of Mars and Jupiter.
·
Stars:
Each star
in the sky is an enormous glowing ball of gas. Our sun is a medium-sized star. Stars
can live for billions years.
·
Galaxy:
A Galaxy is
any large scale system of stars, gases, dust and plasma within the universe. Galaxy
is of different size and shape. Our Galaxy is called Milky Way Galaxy.
·
Constellation:
A constellation
is a group of stars which are seen from Earth, form a pattern. The star in the
sky are divided into 88 constellations.
·
Pole star:
This is a star which is seen directly above the North Pole on the axis of rotation of the
Earth. All constellation appears to revolve around the Pole Star.
·
Artificial
Satellites:
Artificial
Satellites are man-made vehicles launched by rockets into the orbit around the
earth. All the Artificial Satellites have a finite life and will eventually
burn like meteors.
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