A satellite is an object which has been placed into orbit by human being. Sometimes, satellites are called artificial satellites in order to differ them from natural satellites .
In the year of 1957,the first artificial satellites created was SPUTNIK 1, prior to that lots artificial satellites have been launched.Satellites are used for a large number of purposes.
Sputnik 1 helped to identify the density of high atmospheric layers through measurement of its orbital change and provided data on radio-signal.
Nowadays, satellites are common tools in technology such as clocks, telephones and computers. Satellites also used for communications, environmental monitoring, and weather forecasting.
therefore, artificial satellites plays an important role in the earth, it helps us to predict such calamities or natural disasters and to gather information about our universe.
“The more you know, the more you realize you know nothing.”