Freestanding emergency departments (EDs)—either satellite branches of hospitals or independently operated facilities—have popped up across the country. Texas has the most, with 338 freestanding EDs as of May 2023, and ...
Apr 12, 2024
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Children who live in areas with natural spaces (e.g., forests, parks, backyards) from birth may experience fewer emotional issues between the ages of 2 and 5, according to a study published in JAMA Network Open.
Apr 10, 2024
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People continuously exposed to bright, artificial light at night may be at increased risk of developing conditions that affect blood flow to the brain and having a stroke, according to research published in Stroke.
Mar 25, 2024
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A new study led by researchers at the University of North Carolina at Chapel Hill Institute for the Environment, Boston University School of Public Health and the Environmental Defense Fund finds that pollution from oil and ...
Mar 12, 2024
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Trees play a big role in how children in cities develop asthma. But it's not as simple as "more trees equals less asthma." It depends on the season: trees decrease the risk of developing asthma during the leafy season but ...
Mar 6, 2024
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Living in leafy areas near gardens, parks, and green spaces, may boost bone density and lower the risk of osteoporosis, finds research published online in the Annals of the Rheumatic Diseases.
Mar 5, 2024
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People who experience heat stress during exercise may need more recovery time to let their muscles heal, according to a new mouse study published ahead of print in the American Journal of Physiology-Regulatory, Integrative ...
Feb 13, 2024
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Researchers at Karolinska Institutet and SciLifeLab in Sweden have combined artificial intelligence (AI) techniques used in satellite imaging and community ecology to interpret large amounts of data from tumor tissue. The ...
Nov 13, 2023
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Decades of redlining—a longstanding banking practice that blocked people of color from getting mortgages—continue to perpetuate racial and socioeconomic inequality in the San Francisco Bay Area and across the country, ...
Sep 29, 2023
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People exposed to a wildfire within a year after having lung cancer surgery have significantly lower chances of survival compared to lung cancer patients who are not exposed to wildfires, researchers from Emory University, ...
Aug 1, 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
