Chapter 17 Stars and The Solar System

  • The phases of the moon occurs because we can see only that part of them which reflects the light of the sun towards us.
  • Stars appears to move from east west.
  • The solar system consists of eight planets and a host of asteroid comets and meteors.
  • A body revolving around another body is known as satellite.
  • Moon is natural satellite of the earth. Some planets also have natural satellites.
  • Artificial satellite is an man- made device which is orbiting around the earth, moon or other planet. It transmits the scientific information.
  • Asteroids are the small pieces of rock or metals that revolve around the sun in between the orbits of Mars and Jupiter.
  • Cassiopeia is a prominent constellation which is visible in the northern sky, in winter season.
  • A small heavily body which is made up of ice and dust that revolve around the sun is called as comets.
  • The sun, moon and other objects which are present in the sky are known as celestial objects.
  • Constellation is a group of stars which forms a recognizable pattern in the sky.
  • Distance travelled by light in one year is called as one light year.    

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