Engineering
For decades, satellites have helped meteorologists forecast weather, offer cable, television, and radio providers a way to relay signals to their customers, and provide scientists with a tool to gather data for various types ...
Jul 1, 2022
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43
Electronics & Semiconductors
Low earth orbit (LEO) satellites are being increasingly used for environmental monitoring of the earth, as well as for logistic purposes, such as the navigation of maritime vessels. The data transmitted from the satellite ...
Jun 24, 2022
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31
Engineering
Satellites equipped with remote sensing technology execute many critical national security missions, from detecting explosions to tracking sea ice, but until now it could take a team years to move from a concept to a deployable ...
Jun 8, 2022
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49
Telecom
Birmingham scientists have revealed a new beam-steering antenna that increases the efficiency of data transmission for 'beyond 5G'—and opens up a range of frequencies for mobile communications that are inaccessible to currently ...
Jun 3, 2022
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116
Telecom
The world's first mission to remove several small telecommunications satellites from orbit once they reach the end of their operational service is about to start building and testing its prototype spacecraft.
May 27, 2022
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15
Computer Sciences
Skoltech researchers have trained a neural model to determine the height of trees on satellite imagery to monitor the natural environment, infrastructure, and timber supply. Unlike prior solutions, the model presented in ...
May 20, 2022
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24
Computer Sciences
In recent years, crowdsourcing, which involves recruiting members of the public to help collect data, has been tremendously helpful to provide researchers with unique and rich datasets, while also engaging the public in the ...
May 19, 2022
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104
Energy & Green Tech
Researchers at the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) created a solar cell with a record 39.5% efficiency under 1-sun global illumination. This is the highest efficiency solar cell of ...
May 19, 2022
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436
Automotive
Today's connected cars are dynamic, updateable devices—and, because they can be updated, they are well equipped to become tomorrow's cars. ESA is working with European carmakers to ensure that connected vehicles harness ...
May 9, 2022
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5
Computer Sciences
Using an artificial neural network, researchers at ETH Zurich have created the first high-resolution global vegetation height map for 2020 from satellite images. This map could provide key information for fighting climate ...
Apr 20, 2022
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159
In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon.
The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. By 2009 thousands of satellites have been launched into orbit around the Earth. These originate from more than 50 countries and have used the satellite launching capabilities of ten nations. A few hundred satellites are currently operational, whereas thousands of unused satellites and satellite fragments orbit the Earth as space debris. A few space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Venus, Mars, Jupiter and Saturn.
Satellites are used for a large number of purposes. Common types include military (spy) and civilian Earth observation satellites, communication satellites, navigation satellites, weather satellites, and research satellites. Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit.
Satellites are usually semi-independent computer controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control and orbit control.
This text uses material from Wikipedia, licensed under CC BY-SA
