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Book 1: Chapter 24 - Our Sky
  1. The Sun is the star at the centre of the Solar System. It has a diameter of about 1,392,000 km, about 109 times that of Earth.
  2. The Moon is the only natural satellite of the Earth and the fifth largest satellite in the Solar System.
  3. A star is a huge sphere of very hot and glowing gas. Stars produce their own light and energy by a process called nuclear fusion.
  4. A cloud is a visible mass of liquid droplets or frozen crystals made of water.
  5. Rainbows can be observed whenever there are water drops in the air and sunlight shining from behind at a low altitude angle.
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