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THIRD PERIOD

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Name of the Teacher:� SOPAN D. SAWALE �(TGT So.St.)��Name of the School: �JNV Hingoli (M.S.)� �

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THE MOON�

  • Our earth has only one satellite, that is, the moon.
  • Its diameter is only one-quarter that of the earth.
  • 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.
  • As a result, only one side of the moon is visible to us on the earth.

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ASTEROIDS�

  • Apart from the stars, planets and satellites, 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

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METEOROIDS�

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

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  • Sometimes these meteoroids come near the earth and tend to drop upon it.

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  • Sometimes, a meteor without being completely burnt, falls on the earth and creates a hollow.

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GALAXY & UNIVERSE

  • A Galaxy is a huge system of billions of stars, and clouds of dust and gases.
  • In ancient India, it was imagined to be a river of light flowing in the sky. Thus, it was named Akash Ganga.
  • There are millions of such galaxies that make the Universe.
  • We are not certain about its size but we know that all of us – you and I belong to this universe.

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RECAP QUESTIONS

  • 1) Why is moon called satellite even it is a celestial body?
  • 2) What is meteoroids?
  • 3) What do you mean by galaxy?
  • 4) What is difference between galaxy and universe?

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SUMMARY

All objects belonging to space are Celestial Bodies.

Small Celestial Bodies that revolve around planets are called satellites.

Earth is the only planet in our solar system where life exists.

Small pieces of rocks which move around the sun are called Meteoroids.

Galxies are large clusters of millions stars.

All objects belonging to space are Celestial Bodies.

Planets move around the sun in fixed path which is called orbit..

The sun, eight planets,satellites and other celestial bodies form the solar system.

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END OF THE CHAPTER