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  • The phases of the moon occur because we can see only that part of the moon which reflects the light of the Sun towards us. 
  • Stars are celestial bodies that emit light of their own. Our Sun is also a star. 
  • It is convenient to express distances of stars in light years. 
  • Stars appear to move from east to west. 
  • The pole star appears to be stationary from the Earth, because it is situated close to the Earth, because it is situated close to the direction of the axis of rotation of the Earth. 
  • Constellations are groups of stars that appear to form recognisable shapes. 
  • The solar system consits of eight planets and a host of asteroids, comets and meteors. 
  • A body revolving around another body is called a satellite. 
  • Moon is the natural satellite of the Earth. Some planets also have natural satellites. 
  • Venus is the brightest planet in the night sky. 
  • Jupiter is the largest planet of the solar system. 
  • The artificial satellites revolve around the Earth. They are much closer than the moon. 
  • Artificial satellites are used for weather forcasting, long distance communication and remote sensing.

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