Fires that blaze through the wildland-urban interface (WUI) are becoming more common around the globe, a trend that is likely to continue for at least the next two decades, new research finds.
Earth Sciences
27 minutes ago
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Far more methane, a potent greenhouse gas, is being released from landfills and oil and gas operations around the world than governments realized, recent airborne and satellite surveys show. That's a problem for the climate ...
Earth Sciences
5 hours ago
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Tropical marine species venturing into new areas as the climate changes could fall victim to another effect of the phenomenon—as bursts of cold water from the deep sea suddenly kill them.
Plants & Animals
8 hours ago
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California's Death Valley, the driest place in North America, has hosted an ephemeral lake since late 2023. A NASA-led analysis recently calculated water depths in the temporary lake over several weeks in February and March ...
Earth Sciences
13 hours ago
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Plans by SpaceX and other companies to boost the number of rocket launches sometimes seen streaking across San Diego County's skies have prompted the California Coastal Commission to question the environmental effects.
Environment
Apr 15, 2024
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The climate regulates plant growth and yet the climate is also influenced by plants. A study by Martin Luther University Halle-Wittenberg (MLU), which was published in the journal Global Change Biology, has found that ecosystems ...
Plants & Animals
Apr 15, 2024
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One of Brazil's top scientists, Eneas Salati, once said, "The best thing you could do for the Amazon rainforest is to blow up all the roads." He wasn't joking. And he had a point.
Environment
Apr 14, 2024
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It's Saturday, which means that in a universe where the arrow of time moves backward, people have to go to work tomorrow. In such a hypothetical universe, Garfield hates Fridays—tough to imagine. This week, we looked at ...
By analyzing the data from ESA's Gaia satellite, Chinese astronomers have detected a new tidal stellar stream in the northern hemisphere, which has a low metallicity and a relatively high energy. The finding was reported ...
A reaction wheel—one of the heaviest parts of a space mission, its changing rotation used to shift a satellite's orientation—seen in a plasma wind tunnel belonging to the High Enthalpy Flow Diagnostics Group (HEFDiG) ...
Space Exploration
Apr 11, 2024
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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
