Ch – 1 The Earth In The Solar System

Important Definitions:

  • The sun, the moon and all those objects shining in the night sky are called celestial bodies.
  • The celestial bodies which have their own heat and light and emit energy in large amounts are known as stars.
  • The various patterns formed by different groups of stars are known as constellations. Eg: Ursa Major, Saptarishi, etc.
  • The North star which indicates the north direction is known as the Pole Star.
  • The celestial bodies which don’t have their own heat and light and get lit by the light of stars are known as planets.
  • The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids form the solar system.
  • The planets of the solar system move around the sun in fixed elongated paths. These paths are known as orbits.
  • The celestial bodies that move around planets in the same way as the planets move around the sun are known as Satellites.
  • The satellites designed by scientists to gather information about the universe or for communication are known as Human made satellites.
  • The numerous tiny bodies that move around the sun are known as asteroids. They are found between the orbits of Mars and Jupiter.
  • The small pieces of rocks that move around the sun are called Meteoroids.
  • A huge system of billions of stars and clouds of dust and gases is known as Galaxy.

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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