Planets And Satellites


 
 
Concept Explanation
 

Planets and Satellites

Those celestial bodies which revolve around the Sun in their orbits are called planets. There are eight planets in the solar system. Such as Mercury, Venus, Earth, Mars Jupiter, Saturn, Uranus and Neptune.

  • The celestial bodies which revolve around the planets are called satellites as of the moon is a natural satellite of the Earth. Aryabhatta and INSAT - B are artificial satellites of the Earth.
  • There are two types of satellites - geostationary satellite and polar satellite.
  • Geostationary Satellite :- If an artificial satellite is so high above the Earth that its rotation period is exactly equal to the rotation period (24 hours) of the Earth's axial motion, then that satellite will be stationary relative to the Earth. These types of satellites are called geostationary satellites or synchronous satellites.

  • Geostationary satellites orbit the Earth in a radius of 12200 km at an altitude of 35830 ( approx 3600) km above the Earth level from west to east and have a period of 24 hours and radius of its orbit is about 4200 km. Their angular velocity is equal to the Earth's own linear speed 3.1 km / s. It occurs. These satellites are used for telecommunications and other communication systems.
  • INSAT - 2B and INSAT - 2C are synchronous satellites of India. They are used to transmit Doordarshan programs, telephone communications and radio signals to distant places.
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