Have you look at the sky on a cloudless clear night? What do you see there high up in the sky? There millions of start hiding the secrets of the universe. Among them, if you look at the sky very carefully for some time,you can see blinking stars moving from north to south or south to north and you will understand that their movement is very fast. What are they? Why are they moving so fast? They are man made stars; they are called artificial satellites. An artificial satellite is a spacecraft. It orbits the Earth at a fixed distance.
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