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N.C.E.R.T class 6 Geography Chapter-1 .The Earth in the Solar System Class 6 Notes

CHAPTER- 1

The Earth in the Solar System Class 6 Notes Geography Chapter 1


THE EARTH IN THE SOLAR SYSTEM



The whole sky is filled with tiny objects some are bright and some are dim. The object we see in night are moon, stars ,etc. 

Poornima –We can see a full moon once a month. It is Full moon night or Poornima.

Amavasya- we cannot  see the  moon at all once a moon .  It is a New moon night or Amavasya. 

The sun, the moon and all those objects shining in the night sky are called celestial bodies.

The sun and the other stars are hot ball of gases. They look very tiny because they are millions of kilometre far from earth. The sun look large then other stars because it is not that much far from earth.
While watching the night sky, you may notice various patterns formed by different groups of stars. These are called constellations. Example - Ursa Major , big bear,  Saptarishi , Leo, etc.


The North star indicates the north direction. It is also called the Pole Star.

The word ‘planet’ comes from the Greek word “Planetai” which means ‘wanderers’.

THE SOLAR SYSTEM

The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids form the solar system. We often call it a solar family, with the sun as its Head.

. The Sun

The sun is in the centre of the solar system. It is huge and made up of extremely hot gases. The sun is the ultimate source of heat and light for the solar system.

Planets

There are eight planets in our solar system. In order of their distance from the sun, they are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. All the eight planet moves in there fixed path called orbit.



The Earth

The earth is the third nearest planet to the sun. In size, it is the fifth largest planet. It is slightly flattened at the poles. That is why, its shape is described as a Geoid. Geoid means an earth-like shape.

The Moon

Our earth has only one satellite, that is, the moon. Its diametre is only one-quarter that of the earth. It appears so big because it is nearer to our planet than other celestial bodies. It is about 3,84,400 km away from us. The moon moves around the earth in about 27 days .It takes exactly the same time to complete one spin.



.. A Satellite is a celestial body that moves around the planets in the same way as the planets move around the sun.

. Asteroids

Apart from the stars, planets and satellites, there are numerous tiny bodies which also move around the sun. These bodies are called asteroids.



Meteoroids

The small pieces of rocks which move around the sun are called meteoroids.
. Galaxy is a huge system of billions of stars, and clouds of dust and gases. 
There are millions of such galaxies that make the Universe.



Note:- This notes is prepared by Abhinav Khushwaha.

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