THE EARTH IN THE SOLAR SYSTEM



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SAH ACADEMY

THE DIGITAL WAY OF LEARNING


6th Class Geography NCERT 

THE EARTH IN THE SOLAR SYSTEM




Ø  Full moon – Poornima



Ø  New moon – Amavasya





Ø  Celestial body – the sun, the moon and all those objects shining in the night sky are called Celestial bodies.



Ø  Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. The sun is a star.





Ø  The various patterns formed by different group of stars are called constellations. Ursa Major or Big bear is one such constellation. Small bear or Saptarishi.



Ø  The North star indicates the north direction. It is also called the pole star.





Ø  Some celestial bodies don’t have their own heat and light. They are lit by the light of the stars. Such bodies are called Planets.  The word ‘planet’ comes from the Greek Word “plantai” which means ‘wonderers’.



Ø   ‘Sol’ in Roman mythology is the ‘Sungod’. ‘Solar’ means ‘related to the sun’. The family of the sun is called the solar system.





Ø  The Sun

-          Centre of the solar system

-          Made up of extremely hot gases

-          It provides the pulling force that blinds the solar system.

-          Ultimate source of heat and light for solar system



Ø  All the nine planets of the solar system move around the sun in fixed paths. These paths are elongated. They are called orbits.



Ø  Mercury is nearest to the sun. It takes only about 88 days to complete one round along its orbit.





Ø  Venus is considered as ‘Earth’s –twin’ because its size and shape are very much similar to that of the earth.



Ø  The Earth

-          It is the fifth largest planet.

-          Its shape is described as a Geoid.

-          Blue planet



Ø  The Moon

-          Earth’s satellite

-          It is about 3,84,400 km away from the Earth

-          The moon moves around the earth in about 27 days.



Ø  Neil Armstrong was the first man to step on the surface of the moon on 29 July 1969.



Ø  Apart from the stars, planets and satellite, there are numerous tiny bodies which also move around the sun. These bodies are called asteroids. They are found between the orbits of Mars and Jupiter. The largest asteroid is the Ceres.





Ø  The small pieces of rocks which move around the sun are called meteoroids.



Ø  A 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.  




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