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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16
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
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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1
Energy & Green Tech
On June 12 this year, the UK's last remaining coal-fired power station was awoken from a 46-day slumber to meet demand for electricity to run air-conditioning units.
Aug 18, 2023
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8
Telecom
Amazon is so eager to get its first test satellites for its Project Kuiper internet constellation up into space that it has decided to switch rides again.
Aug 14, 2023
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28
Energy & Green Tech
China's commitment to achieving carbon neutrality takes a significant step forward with the successful collaboration between the Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP/CAS), Harbin Institute of ...
Jul 24, 2023
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1
Business
Amazon said Friday it will invest $120 million to build a satellite construction facility at NASA's Kennedy Space Center, as part of its plans to launch a space internet service to rival SpaceX's Starlink.
Jul 21, 2023
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1
Hi Tech & Innovation
Indiscriminate shelling along the front lines of Russia's invasion of Ukraine has seeded farm fields and towns with untold numbers of unexploded munitions. Now University of Maryland geographical sciences researchers are ...
Jul 19, 2023
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24
Telecom
Thousands of satellites are currently orbiting the Earth, and there will be many more in the future. Researchers from Ruhr University Bochum and the CISPA Helmholtz Center for Information Security in Saarbrücken have assessed ...
Jul 13, 2023
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1
Engineering
The joint research team of Electrical Engineering and Computer Science Professor JeongHo Kwak at the DGIST and Aerospace Engineering Professor Jihwan Choi at the KAIST have proposed a novel network slicing planning and handover ...
Jul 6, 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
