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Theory:

Artificial satellites are man-made satellites that revolve around the Earth and are different from the natural satellites. These man-made satellites are launched from the Earth and revolve around it in a much closer orbit than the moon.
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Artificial satellite
Indian satellites:
India has launched many satellites and contributed to the development of various fields.
The first Indian satellite is Aryabhata, which was named after a famous ancient Indian Astronomer.
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Aryabhata
 
Other Indian satellites:
  • INSAT
  • IRS
  • Kalpana-1
  • EDUSAT
Applications of satellites:
There are many practical applications of artificial satellites. Some of them are,
  • Weather forecasting,
  • Transmission of television and radio signals,
  • Telecommunication, and
  • Remote sensing.
Remote sensing:
The process of collecting information about an object without making any physical contact with the object is known as remote sensing.
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Remote sensing satellite
 
Smallest satellite:
The world’s smallest satellite, Kalam Sat, was built by Rifath Sharook, a school student from Tamil Nadu. This \(64\ -gram\) satellite was launched into space on \(June\ 22,\ 2017\), by NASA.
 
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Reference:
https://upload.wikimedia.org/wikipedia/commons/4/4c/Mec_aryabhatta.jpg
https://upload.wikimedia.org/wikipedia/commons/c/c8/RapidEye_Satellites_Artist_Impression.jpg
Kalamsat Image credit: 8th TN Science Textbook Page no 87