Psychology & Psychiatry

Exposure to great outdoors boosted mental health during pandemic

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 ...

Diseases, Conditions, Syndromes

Data suggests pandemic fatalities much higher than estimated

When a COVID-19 wave hit India over the winter and spring of 2021, hospitals were filled beyond capacity, oxygen was nearly impossible to obtain, and community networks for tending to the dead were overwhelmed. Government ...

Diseases, Conditions, Syndromes

Climate change could reshape pathogen profile of diarrheal disease

More than half a million children under five years old die of diarrheal disease every year, according to the World Health Organization. Deaths and serious illness are most common in regions without access to clean water. ...

Biomedical technology

How space tech can help the world fight the pandemic

Michael Strahan, former football star and host of "Good Morning America," will be taking off with a crew of five other passengers on Dec. 9, amidst a global pandemic and rising cases of the new omicron variant.

Immunology

Allergy-causing pollen levels much higher in 2010s than 1990s

Allergy-causing airborne grass pollen concentrations in Brisbane air are now almost three times higher than they were in the 1990s, accompanied by an increase in the frequency and proportion of high-extreme grass pollen days.

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Satellite

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