An artificial satellite, a satellite, a space satellite, or a satellite is a man-made device that orbits in outer space around the Earth or around another planet and performs many tasks such as communication, examination, and detection.


A satellite is defined as a machine that is sent to outer space, to begin, after its arrival, to revolve around the Earth or around any other object...

Satellite History

The Soviet Union achieved the first-of-its-kind achievement in the world when it launched the Sputnik 1 satellite into space on October 4, 1957 AD. elliptical to about 98 minutes, and this achievement prompted the competition between the United States and the Soviet Union in space-related studies, in addition to shaping major developments in the military, political, and technological fields.

uses of satellites

There are many important benefits and uses of satellites, most notably the following:

  • Exploring the Solar System: Spacecraft were sent from Earth with the aim of exploring the planets of the solar system by placing them in special orbits to revolve around the planets and form their satellites. Many satellites were also sent to explore the Earth's moon, and the most important satellites are:
  1. Galileo: a satellite orbiting Jupiter.
  2. Cassini: The satellite orbiting Saturn.
  3. Magellan: The satellite orbiting Venus.
  4. Magellan: The satellite orbiting Venus.
  5. Satellites on the Viking Mission to Mars and later the Mars Surveyor.
  • Geographical positioning: The Global Positioning System (GPS) provides the ability to accurately determine the destination in any part of the globe, thanks to a group of interconnected satellites that orbit the Earth.
  • Meteorological study: the private satellite collects weather information and updates it continuously to monitor the Earth’s weather conditions and possible weather fluctuations, by storing the information on special devices, and although the stored data is available in an accurate and timely manner, it can only be taken into consideration. For the next 48 hours only.
  • The study of the universe: The satellites provided many information and cosmic images. The images provided by the Voyager series of planets are among the first images taken from outside Earth, and the Hubble telescope provided clear and accurate cosmic images that surpassed those provided by any terrestrial telescope.

Reasons why satellites do not fall to the ground

There are many reasons that prevent satellites from falling to Earth, including the following:

  • Rotation speed: The satellite can be imagined as a body that is affected only by the force of gravity, and the Karman line, located at an altitude of 100 km, is the limit after which the satellites begin to swim in space, however, the failure of the satellite to fall on Earth is related to its high rotation speed, which increases About 8 kilometers per second.
  • Rotation in distant orbits: Objects close to the atmosphere are at risk of falling due to the force of the atmosphere's molecules attracting them, which leads to their deceleration and eventually fall.
  • Rotation in approved ranges: There are many space orbits around the Earth; Some of them are located in a low range within an altitude of between 160 to 2000 km and are called Low Earth Orbit, where most of the satellites operate in this region and the International Space Station orbits in it. It should be noted that all the satellites that carried people on board were within this altitude, Except for the Apollo programs aimed at the Moon.

International Space Station: Off the Earth, for the Earth, and Beyond.


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