ExTrA ExTrA Fr.: ExTrA A facility at → European Southern Observatory (ESO)'s → La Silla Observatory funded by the European Research Council and the French Agence National de la Recherche with the purpose of detecting and studying → transiting → exoplanets. ExTrA will search for Earth-sized planets orbiting nearby → red dwarf stars. It uses three 0.6-metre telescopes. They regularly monitor the amount of light received from many red dwarf stars and look for a slight dip in brightness that could be caused by a planet passing across a star's disk and obscuring some of its light. The three ExTra telescopes collect light from the target star and four comparison stars and that light is then fed through optical fibres into a → multi-object spectrograph. This innovative approach of adding → spectroscopic information to traditional photometry helps mitigate the disruptive effect of Earth's atmosphere, as well as effects introduced by instruments and detectors, thus increasing the precision achievable. ExTrA, short for Exoplanets in Transits and their Atmospheres, → exoplanet; → transit; → atmosphere. |
extra- ostar-, borun- (#) Fr.: extra- Prefix meaning "outside; beyond the scope of; in addition to what is used or expected." Also extro-. M.E., from L. extra, adverb and preposition, "outside, except, beyond," from exter "outward, on the outside." Ostar-, from os-, → ex-, + -tar comparative suffix (Mid.Pers. -tar; Av. -tara; PIE base *-tero); borun-, from borun "out, the outside" (Mid.Pers. bêron, from bê "outside, out, away" + rôn "side, direction;" Av. ravan- "(course of a) river"). |
extract 1) barhanjidan; 2) barhanje Fr.: 1) extraire; 2) extrait 1a) To draw or pull out, often with great force or effort. From L. extractus, p.p. of extrahere "to draw out," from → ex-"out, out of" + trahere "to draw" "to pull, draw," from PIE root *tragh- "to draw, drag, move." Barhanjidan, from bar- "on; upon; against; before; at; in," → object, + hanjidan "to draw, to pull," variants âxtan, âhixtan, âhiz-, halanjidan, lenjidan; Mid.Pers. âhynj- "to draw up," other Pers. cognate sanjidan, farhang, nehang, etc.; ultimately from prefixed (*a-) Proto-Ir. *θanj- "to pull, draw;" Av. θanj- "to pull, to draw." |
extraction barhanješ Fr.: extraction 1) The act of extracting or the condition of being extracted. |
extragalactic ostar-kahkašâni, borun-kahkašâni Fr.: extragalactique Of, pertaining to, or dealing with the space beyond the Milky Way. |
extragalactic astronomy axtaršenâi-ye ostar-kahkašâni, ~ borun-kahkašâni Fr.: astronomie extragalactique The branch of astronomy that deals with objects beyond the Milky Way, especially galaxies and quasars. → extragalactic; → astronomy. |
extragalactic background light (EBL) nur-e paszimine-ye ostarkahkeši Fr.: lumière du fond extragalactique The integrated intensity of all of the light emitted throughout the history of the Universe across the whole of the → electromagnetic spectrum, including those which are not individually detected. The EBL spectrum includes cosmological backgrounds associated with either primordial phenomena, such as the → cosmic microwave background radiation (CMBR), or photons emitted by stars, galaxies and → active galactic nuclei (AGN) due to → nucleosynthesis or other → radiative processes, including → dust scattering, → absorption and reradiation. The EBL may also contain signals that are diffuse and extended, including high-energy photons associated with dark matter particle decays or annihilation. → extragalactic; → background; → light. |
extraordinary ostaršunik Fr.: extraordinaire 1) Beyond what is usual, ordinary, regular, or established. |
extraordinary ray partov-e ostaršunik Fr.: rayon extraordinaire When a beam of → unpolarized light is incident on a → doubly refracting crystal, there will be two refracted rays. The ray for which → Snell's law does not hold. → extraordinary; → ray. |
extrapolate borunyâftan (#) Fr.: extrapoler Math.: To estimate the value of a result outside the range of a series of known values. From → extra- + (inter)polate, → interpolate. From borun, → extra- + yâftan, yâbidan "to find, discover; to obtain, acquire;" Mid.Pers. ayâftan, ayâpênitan "to reach, attain;" Manichean Mid.Pers. 'y'b "to attain;" Parthian, Sogdian (+ *pati-) pty'b "to reach, obtain;" Av. ap- "to reach, overtake," apayeiti "achieved, reached;" Skt. âp- "to reach, gain," âpnoti "reaches, gains;" Gk. hapto, haptomai "to touch, cling to, adhere to;" L. apiscor "touch, reach;" PIE base *ap- "to take, reach." |
extrapolation borunyâbeš (#) Fr.: extrapolation Predicting the value of unknown data points by projecting a function beyond the range of known data points. Verbal noun of → extrapolate. |
extrasolar ostarxoršidi Fr.: extrasolaire Not belonging to the → solar system; outside, or originating outside, the solar system. |
extrasolar planet sayyâre-ye ostarxoršidi Fr.: planète extrasolaire A planet which belongs to a star other than → Sun, and therefore does not belong to our → solar system; same as → exoplanet. → extrasolar; → planet. |
extrasolar system râžmân-e ostarxoršidi Fr.: système extrasolaire A → planatary system around a star other than the Sun. Same as → exoplanetary system . → extrasolar; → system. |
extraterrestrial ostarzamini Fr.: extraterrestre 1) (adj.) Of or from outside the limits of the Earth. → extra- + → terrestrial. |
extraterrestrial life zist-e ostarzamini Fr.: vie extraterrestre Life that may exist and originate outside the planet Earth. → extraterrestrial; → life. |
Search for Extraterrestrial Intelligence (SETI) jost-o-ju-ye huš-e ostar-zamini Fr.: recherche d'intelligence extra-terrestre The scientific attempt to detect → intelligent extraterrestrial → life by surveying the sky to find the existence of → transmissions, especially → radio waves or → light, from a → civilization on a distant → planet. The SETI Institute, that carries out the project, is a private non-profit center founded in 1984. There are many methods that SETI scientific teams use to search for extraterrestrial intelligence. Many of these search billions of radio frequencies that reach Earth from all over the → Universe, looking for an intelligent → radio signal. Other SETI teams search by looking for signals in pulses of light emanating from the stars. → search; → extraterrestrial; → intelligence. |