Why is it dark at night !

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Image result for night hd wallpaper


 Because at night the part of the world where we live has turned away from the sun.Although we cannot feel it ,our planet is spinning in space .it takes a day and a night to turn full circle.
so the side of the earth that is facing the sun is having daylight, and on the other side it's-goodnight


                                                NIGHT AND FACTS


  • On June 21, the northern half of the earth has its longest day and its shortest night.



  • The shortest day and the longest night is on December 21

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