Cord cutters getting more company: Number of pay-TV subscribers drops
If you are one of the millions of Americans who has cut the cord from pay-TV services, you are about to have a lot more company in the coming years.
Aug 8, 2019
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Business
If you are one of the millions of Americans who has cut the cord from pay-TV services, you are about to have a lot more company in the coming years.
Aug 8, 2019
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Energy & Green Tech
The most productive places on Earth for solar power are farmlands, according to an Oregon State University study.
Aug 8, 2019
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Business
The US Department of Justice said Wednesday that Tribune Media and Nexstar must divest television stations in 13 markets to address concerns over their $6.4 billion merger.
Aug 1, 2019
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Energy & Green Tech
Solar power researchers have traditionally only used the power measurements from single residential solar photovoltaic (PV) systems to estimate the power generated within a city. But one installation isn't a good representation ...
May 28, 2019
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Hi Tech & Innovation
A Boston-based startup is setting out to show the use of phones for better weather forecasting.
Machine learning & AI
Artificial intelligence researchers and data scientists at Facebook have created population density maps. What's so special is that they are more accurate and with higher resolution than any of their predecessors. Derrick ...
Telecom
Amazon on Thursday confirmed it is working on a project to deploy a network of satellites for high-speed internet service in underserved parts of the world.
Apr 5, 2019
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Engineering
For the first time, an international team of scientists from Russia, Estonia and Finland has analyzed the operation of a target panel built in the southeast of Estonia to calibrate orbital satellites and to ensure maximally ...
Feb 19, 2019
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Other
The pilot of the rowboat Alba had a noble goal – to raise awareness and funds for the Scottish Association for Mental Health. And he was going to row 3,400 nautical miles, from Norfolk, Va., to his home in Scotland, to ...
Feb 15, 2019
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Energy & Green Tech
A trio of researchers at École Polytechnique Fédérale de Lausanne has found that solar panels could provide a lot more power for Switzerland than has been previously thought. In their paper published in Proceedings of ...
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