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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]
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 navigation allows precision in the delivery of weapons to targets, greatly increasing their lethality whilst reducing inadvertent casualties from mis-directed weapons. (See Guided bomb). Satellite navigation also allows forces to be directed and to locate themselves more easily, reducing the fog of war.
The term has also been applied to states which are extremely economically dependent on a more powerful nation. The three Pacific Ocean countries associated with the United States under the Compact of Free Association (the Federated States of Micronesia, the Marshall Islands, and Palau) have been called client states. [17] [18] [19]
A military satellite is an artificial satellite used for a military purpose. The most common missions are intelligence gathering, navigation and military communications . The first military satellites were photographic reconnaissance missions.
Spaceflight (or space flight) is an application of astronautics to fly objects, usually spacecraft, into or through outer space, either with or without humans on board.Most spaceflight is uncrewed and conducted mainly with spacecraft such as satellites in orbit around Earth, but also includes space probes for flights beyond Earth orbit.
The following is a list of the largest satellite cities worldwide, with over 500,000 people. A satellite city is defined as subordinate to a central city in a business or infrastructure sense, and it may or may not have more population than the central city due to arbitrary municipal definitions. Excluded are transborder agglomerations.
An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation (EO) from orbit, including spy satellites and similar ones intended for non-military uses such as environmental monitoring, meteorology, cartography and others.