DegrowthDegrowth (décroissance) is a term used for both a political, economic, and social movement as well as a set of theories that criticise the paradigm of economic growth. Degrowth is based on ideas from political ecology, ecological economics, feminist political ecology, and environmental justice, arguing that social and ecological harm is caused by the pursuit of infinite growth and Western "development" imperatives.
Post-growthPost-growth is a stance on economic growth concerning the limits-to-growth dilemma — recognition that, on a planet of finite material resources, extractive economies and populations cannot grow infinitely. The term "post-growth" acknowledges that economic growth can generate beneficial effects up to a point, but beyond that point (cited as $25,000 GDP/capita by Richard Wilkinson and Kate Pickett in their book The Spirit Level) it is necessary to look for other indicators and techniques to increase human wellbeing.
Radio galaxyA radio galaxy is a galaxy with giant regions of radio emission extending well beyond its visible structure. These energetic radio lobes are powered by jets from its active galactic nucleus. They have luminosities up to 1039 W at radio wavelengths between 10 MHz and 100 GHz. The radio emission is due to the synchrotron process. The observed structure in radio emission is determined by the interaction between twin jets and the external medium, modified by the effects of relativistic beaming.
Astronomical radio sourceAn astronomical radio source is an object in outer space that emits strong radio waves. Radio emission comes from a wide variety of sources. Such objects are among the most extreme and energetic physical processes in the universe. In 1932, American physicist and radio engineer Karl Jansky detected radio waves coming from an unknown source in the center of the Milky Way galaxy. Jansky was studying the origins of radio frequency interference for Bell Laboratories. He found "...
Radio astronomyRadio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies. The first detection of radio waves from an astronomical object was in 1933, when Karl Jansky at Bell Telephone Laboratories reported radiation coming from the Milky Way. Subsequent observations have identified a number of different sources of radio emission. These include stars and galaxies, as well as entirely new classes of objects, such as radio galaxies, quasars, pulsars, and masers.
