Dictionary of Space Concepts
The Dictionary of Space Concepts (DSC) provides not only the basis for the advanced English language classes of the Multilingualism Programme; it also serves as larger online support platform for all UNIVERSEH students, with the aim of training specific space terminologies across various fields connected to the space sector. The DSC combines core space concepts and with helpful illustrations, all in an open-project format, which is freely available to everyone inside and outside UNIVERSEH. We welcome your contributions, comments, and expertise!
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Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL
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Black hole Horizon | |||
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Source: https://en.wikipedia.org/wiki/File:Black_hole_-_Messier_87_crop_max_res.jpg Short Definition: The horizon of a black hole is called event horizon and is an astrophysical phenomenon, which describes the “point of no return” where matter and even light can not cross back according to our understandings of physics. The event horizon is a boundary in spacetime, where the gravitational pull becomes absolute. Detailed Definition: The astrophysical phenomenon of the event horizon defines the boundary of spacetime, where the ability of mass to deform spacetime is absolute. Near this event horizon time seems to work differently, because of gravitational time dilation, which appears to slow down clocks near the horizon more than those farther away and the clock would take an infinite amount of time to reach the black hole in itself. The huge amounts of gravitational pull causes any light to redshift in a process called gravitational redshift. A clock that is falling into a black hole would change from being visible from an outside perspective, to the light of it red shifting and then finally it would disappear from view and all this in a mere minute. On the contrary an indestructible observer that falls into a black hole would experience time normally and it would fall into the black hole in a finite amount of time. Etymology: Black hole term was coined in astronomy in 1964 Horizon Greekhorizon (kyklos) àboundary Sample Sentence(s): From an outside perspective an object falling into the black hole horizon would take an infinite amount of time to reach it.
The black hole horizon is the point of no
return, where matter or light are not able to cross back. French: Horizon du trou noir German: Schwarzes Loch-Horizont Polish: Horyzont czarnej dziury Swedish: Horisont för svarta hål Links to Videos/Articles: | |||
Blazar | |||
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Sloan Digital Sky Survey image of blazar Markarian 421. Short Definition: A blazar is a type of active galaxy nucleus with a jet composed of ionized matter traveling at nearly the speed of light, which direction is nearly towards an observer. Due to the jet almost directly shooting towards Earth, a blazar appears much brighter on observations than in case of facing another direction. Blazars are a source of powerful radiation in all electromagnetic spectrum, especially in high-energy gamma rays. Blazars are among the most energetic phenomena in the universe and are an important subject to research. Detailed Definition: Blazars are an extremely bright, starlike object characterized by rapid changes in luminosity and a flat spectrum caused by a jet composed of ionized matter traveling at nearly the speed of light directed at the observer. Blazars emit electromagnetic radiation over a very wide range of frequencies, but mostly distinguished by amount of radio and gamma rays. Due to blazar's instabilities its properties change over time, specifically the variability and intensity of their observable brightness, which is distinguishing blazars from another class of active galactic nucleus, quasars. Blazars are important topics of research in astronomy and astrophysics. Blazar research includes investigation of the properties of accretion disks and jets, the central supermassive black holes and surrounding host galaxies, and the emission of high-energy photons, cosmic rays, and neutrinos. Etymology: Coined by 1978 by astronomer Edward Spiegel from BL Lac object and quasar. Sample Sentence(s): "Blazars are thought to be active galactic nuclei, with relativistic jets oriented close to the line of sight with the observer." Translations: French: Blazar German: Blazare Polish: Blazar Swedish: Blazar Links to Videos/Articles: https://www.merriam-webster.com/dictionary/blazar | |||
