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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.
The first country on Earth to put any technology into space was the Soviet Union, formerly known as the "Union of Soviet Socialist Republics" (USSR). The USSR sent the Sputnik 1 satellite on October 4, 1957. It weighed about 83 kg (183 lb), and is believed to have orbited around the globe.
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 ...
Joint satellite between the Italian Space Agency and the Vatican Dicastery for Communication Oman: AMAN-1 ETCO SatRev: Falcon 9: Vandenberg SLC-4E: 11 November 2023 Launched on the same rocket as the first Djiboutian satellite Djibouti: Djibouti-1A University of Djibouti: University of Montpellier: Launched on the same rocket as the first Omani ...
The term satellite thus became the normal one for referring to an object orbiting a planet, as it avoided the ambiguity of "moon". In 1957, however, the launching of the artificial object Sputnik created a need for new terminology. [5] The terms man-made satellite and artificial moon were very quickly abandoned in favor of the simpler satellite ...
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