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A satellite or an artificial satellite [a] is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting , navigation ( GPS ), broadcasting , scientific research, and Earth observation.
The Oxford English Dictionary traces the concept of satellite states in English back as early as 1780. [4] In times of war or political tension, satellite states sometimes served as buffers between an enemy country and the nation exerting control over the satellites. [5]
Satellite imaging of the Earth surface is of sufficient public utility that many countries maintain satellite imaging programs. The United States has led the way in making these data freely available for scientific use. Some of the more popular programs are listed below, recently followed by the European Union's Sentinel constellation.
A weather satellite or meteorological satellite is a type of Earth observation satellite that is primarily used to monitor the weather and climate of the Earth. Satellites are mainly of two types: polar orbiting (covering the entire Earth asynchronously) or geostationary (hovering over the same spot on the equator ).
Qatar's first satellite flew as a joint project with the French corporation Eutelsat Qatar: Es'hail 1: Es'hailSat: SS/Loral: Ariane 5ECA: Kourou: 29 August 2013: Full ownership of the joint France-Qatar satellite Eutelsat 25B / Es'hail 1 was sold to Es'hailsat in 2018 [24] Peru: PUCP-Sat 1: Dnepr: Dombarovsky: 21 November 2013: Pocket-PUCP ...
The country’s X-ray Polarimeter Satellite, launched on Monday aboard Isro’s PSLV rocket, makes it only the second nation to study black holes and other celestial objects using an orbiting ...
True color image of the Earth from space. This image is a composite image collected over 16 days by the MODIS sensor on NASA’s Terra satellite. NASA Earth science satellite fleet as of September 2020, planned through 2023. Earth observation satellite missions developed by the ESA as of 2019.
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