Telecom
When you think about location data on your mobile phone, tablet or laptop, what comes to mind? Mailing addresses? Postal codes? These data indicate where you live, where you work, and the places you visit.
Feb 21, 2023
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Engineering
The US military has now shot down four high-altitude objects that had entered American and Canadian airspace, raising questions about their purpose and origin.
Feb 15, 2023
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31
Business
JPL-developed technologies, including VITAL, FINDER, 3D-printing methods, and Voyager spacecraft communications, are featured in the agency's technology publication.
Feb 1, 2023
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56
Hardware
Imagine being in a boat miles from shore when the engine fails, or getting lost in a remote spot while hiking in the Rocky Mountains. Having a beacon or transmitter that sends a distress signal via satellite could mean the ...
Jan 31, 2023
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Telecom
Incidents such as the 2021 Colonial Pipeline hack and ransomware attacks on U.S. colleges and universities illustrate the importance of robust cybersecurity measures that protect the technologies and services that people ...
Jan 31, 2023
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54
Business
Many space-based technologies are still looking for their "killer app"—the thing that they do better than anything else and makes them indispensable to whoever needs to have that app to solve a problem. At this point in ...
Dec 19, 2022
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Engineering
To meet the world's rapidly growing data consumption and increasing bandwidth requirements, satellite communications are shifting to higher frequencies. The W-band (75–110 GHz) is well suited for use in space, but technical ...
Dec 12, 2022
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Energy & Green Tech
The ALARM research team, conducting a European scientific project coordinated by Universidad Carlos III de Madrid (UC3M), has developed a new prototype early warning system to monitor natural phenomena that threaten the safety ...
Nov 28, 2022
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7
Business
Carlsbad, California's Viasat said Tuesday that it expects to begin launching its next-generation broadband Internet satellite constellation early next year—marking another delay in getting the terabyte-class satellites ...
Nov 9, 2022
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22
Engineering
Scientists at the Swiss Plasma Center at EPFL, in collaboration with Beyond Gravity and with the support of the ESA, have developed a slip ring assembly that can more than triple the operational voltage of new-generation, ...
Nov 2, 2022
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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
