Machine learning & AI
The interaction of machine learning and optics/photonics is transforming the way we design new photonic structures, unearth latent physical laws, and develop intelligent photonic devices. Despite certain achievements, a major ...
14 hours ago
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Machine learning & AI
Two artificial intelligence-driven models designed by researchers from the Penn State College of Information Sciences and Technology could help promote the rights of low-income renters in the United States when facing forced ...
Mar 24, 2023
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Internet
It's hard for many of us to imagine a world without instant, limitless internet access. Some have even argued that it should, alongside access to clean water and electricity, be considered a basic human right.
Mar 1, 2023
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Internet
Within the rapidly changing landscape of data providers, governments must address concerns over who collects and uses data to support the public interest. Dr. Peter Johnson, a geographer at the University of Waterloo, is ...
Feb 23, 2023
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Electronics & Semiconductors
On-chip distributed radiation sensors and current-sharing techniques can be used to reduce the impact of radiation on the radio and power consumption of small satellites, respectively, as shown by scientists from Tokyo Tech. ...
Feb 21, 2023
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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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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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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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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
