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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.
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 satellite state or dependent state is a country that is formally independent but under heavy political, economic, and military influence or control from another country. [1]
Courtesy of Society for Science & the Public. This year's 30 Broadcom MASTERS finalists were announced on Oct. 6. Check out how these pre- and early teens wow-ed the judges with their creativity ...
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 first weather satellite, Vanguard 2, was launched on February 17, 1959. [4] It was designed to measure cloud cover and resistance, but a poor axis of rotation and its elliptical orbit kept it from collecting a notable amount of useful data. The Explorer 6 and Explorer 7 satellites also contained weather-related experiments. [3]
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 ...
The listings summarize all countries' and regional authorities' space agencies with a comparative summary of demonstrated capabilities. The objectives include national prestige, exploitation of remote sensing information, communications, education, and economic development. These agencies tend to be civil in nature (vs military) and serve to ...