Biomedical engineers have grown living skeletal muscle that looks a lot like the real thing. It contracts powerfully and rapidly, integrates into mice quickly, and for the first time, demonstrates the ability to heal itself ...
Mar 31, 2014
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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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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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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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City parks and green spaces help counter heat, boost biodiversity, and instill a sense of calm in the urban jungle.
Jun 29, 2023
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As with COVID, public health agencies around the world have struggled to predict which communities will be hit the hardest with malaria, a life-threatening disease that infected an estimated 247 million people in 2021. A ...
Feb 22, 2023
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Several years ago, a team of scientists at Lehigh University developed a predictive model to accurately forecast Ebola outbreaks based on climate-driven bat migration. Ebola is a serious and sometimes-deadly infectious disease ...
Sep 1, 2022
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Cognitive function at middle age is a strong predictor of whether a person may develop dementia later in life. Now, a new study led by a Boston University School of Public Health (BUSPH) researcher has found that increasing ...
Apr 27, 2022
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People exposed to more green space during the first year of the COVID-19 pandemic reported significantly less depression and anxiety, according to new University of Colorado Boulder research published March 2 in the journal ...
Mar 2, 2022
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Researchers at the Hong Kong University of Science and Technology (HKUST) have discovered the constructive role of a protein in driving the skeletal muscle stem cell activation to repair muscle following damage, laying the ...
Feb 24, 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
