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Artificial satellites are spacecraft placed into orbit to perform specific missions, usually including power generation and communications to ground stations.
An artificial (human-made) satellite is an object—typically a spacecraft—placed into orbit around a celestial body. Most satellites are launched from Earth into space and then maintain or adjust their orbit using propulsion. They commonly include onboard power generation (such as solar panels or radioisotope power systems) and communications equipment (often transponders) to send data to ground stations. Satellites may also be grouped into coordinated systems called constellations. Artificial satellites serve many purposes. Civilian uses include communication relay (TV, telephone, radio, internet), weather and Earth observation (remote sensing of land, oceans, atmosphere, and climate), navigation (e.g., GPS using predictable signal timing and orbital geometry), and scientific research such as space telescopes that observe across the electromagnetic spectrum. Some satellites also support military missions such as reconnaissance, early warning, signals intelligence, and potentially weapon delivery. Crewed orbital platforms like space stations are also considered artificial satellites. Satellites are placed into different orbits depending on mission needs. For example, geostationary satellites remain fixed in the sky relative to a ground point, while Sun-synchronous orbits provide consistent lighting for imaging. The growth in satellite numbers has increased collision risk and space-debris concerns, making safe operations and mitigation important.
Artificial satellites are spacecraft placed into orbit to perform specific missions, usually including power generation and communications to ground stations.
They are used for communication, Earth observation/weather monitoring, navigation, scientific research, and some military functions.
Satellites operate in different orbit types (e.g., low Earth orbit, geostationary, Sun-synchronous) based on coverage and measurement requirements, and increasing debris raises collision risks.
A human-made object, typically a spacecraft, placed into orbit around a celestial body to perform specific functions.
An onboard communications device that receives, amplifies, and retransmits radio signals between a satellite and ground stations.
A coordinated group of similar satellites working together to provide continuous or enhanced coverage.
An orbit in which a satellite stays fixed in the sky relative to a point on Earth’s equator.
A near-polar orbit designed so a satellite passes over the same parts of Earth with consistent lighting conditions for imaging.
An orbit close to Earth that is commonly used for high-resolution Earth observation and many satellite constellations.
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