Engineering
From the outside, the Kölnbrein water dam, operated by Verbund in Carinthia, which is Austria's highest dam, and the DC Tower in Vienna, Austria's tallest building, do not have much in common, but for a research group around ...
Dec 27, 2023
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Engineering
Electricity is an indispensable resource for our daily lives; it powers our homes, industries, and agriculture, among other things. Electricity is generated in power plants that are often located in remote areas due to safety ...
Dec 14, 2023
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Telecom
In a research letter published on July 11, 2023, in Geo-spatial Information Science, a research group led by Deren Li and Mi Wang from Wuhan University unveiled the LuoJia3-01, an experimental satellite that integrates state-of-the-art ...
Nov 30, 2023
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Machine learning & AI
To most effectively deliver aid to alleviate poverty, you have to know where the people most in need are. In many countries, this is often done with household surveys. But these are usually infrequent and cover limited locations.
Nov 28, 2023
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Hardware
The new Galileo satellite model from Thales Alenia Space underwent mechanical and signal performance testing this summer at ESA's ESTEC Test Center. Structural models resisted launch-like noise and vibrations while an electrical ...
Nov 17, 2023
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Telecom
The boss of European satellite operator Eutelsat knows her task will not be easy: to forge a competitor to Elon Musk's Starlink and provide superfast internet from space.
Nov 15, 2023
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Energy & Green Tech
"Hard-to-decarbonize" (HtD) houses are responsible for over a quarter of all direct housing emissions—a major obstacle to achieving net zero—but are rarely identified or targeted for improvement.
Nov 2, 2023
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Telecom
ESA's navigation testbed vehicle participated in a campaign organized by Norwegian governmental authorities to assess the impact of jamming and spoofing on satnav systems and test innovative technologies for detection and ...
Oct 18, 2023
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1
Telecom
Amazon launched the first test satellites for its planned internet service on Friday as a rival to SpaceX's broadband network.
Oct 7, 2023
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31
Internet
Rural and remote communities in Canada often rely on satellites to access the internet, but those connections are fraught—with many glitches and service interruptions because the technology can be unreliable. The inequity ...
Sep 20, 2023
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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
