An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1244
cosmic web
  وپ ِ کیهانی   
vap-e keyhâni

Fr.: toile cosmique   

The entire, large-scale structure of the → Universe in which → galaxy clusters are connected by → cosmic filaments (made up of → dark matter and → baryons) in a spongelike geometry, while the low-density → voids are connected to each other by low-density tunnels. The term cosmic web was coined in 1996 by J. Richard Bond et al. (Nature, 380, 603).

cosmic; → web.

cosmic-ray burst
  بلک ِ پرتوهای ِ کیهانی   
belk-e partowhâ-ye keyhâni

Fr.: sursaut de rayons cosmiques   

An intense beam of cosmic rays coming from any direction on the sky, which originates outside the solar system.

cosmic; → ray; → burst.

cosmic-ray event
  رویداد ِ پرتوهای ِ کیهانی   
ruydâd-e partowhâ-ye keyhâni

Fr.: événement des rayons cosmiques, un cosmique   

Spurious signals in CCD frames caused by ionizing radiation which appear as a set of pixels with intense values sparsely scattered over the CCD frame. High energy particles generate muons, which deposit around 80 electrons per micron in silicon. With a collection depth of 10-20 microns, a cosmic-ray event is seen on a CCD frame as having a signal of up to a few thousand electrons, usually concentrated in one or two pixels. Although attributed to cosmic-ray hits, they may also be due to background terrestrial radiation.

cosmic rays; → event.

cosmic-ray ionization
  یونش ِ پرتوهای ِ کیهانی   
yoneš-e partowhâ-ye keyhâni

Fr.: ionisation par rayons cosmiques   

The ionization of → interstellar medium (ISM) gas by → cosmic rays. Cosmic rays are a primary source of ionization, competing with stellar → ultraviolet photons and → X-rays produced by embedded → young stellar objects. Cosmic rays play a key role in the chemistry and dynamics of the interstellar medium. The ionization fraction in turn drives the chemistry of → molecular clouds and controls the coupling of the gas with the Galactic → magnetic field. Moreover, cosmic rays represent an important source of → heating for → molecular clouds because the energy of primary and secondary electrons produced by the ionization process is in large part converted into heat by → inelastic collisions with ISM atoms and → molecules (see, e.g., Padovanit et al., 2009, arXiv:0904.4149).

cosmic; → ray; → ionization.

cosmic-ray shower
  تندبار ِ پرتوهای ِ کیهانی، رگبار ِ ~   
tondbâr-e partowhâ-ye keyhâni, ragbâr-e ~

Fr.: gerbe cosmique   

An extensive (many kilometres wide) → cascade of ionized particles and electromagnetic radiation produced in the atmosphere when a → primary cosmic rays collides with atmospheric nuclei creating many → secondary cosmic rays. Also known as → air shower.

cosmic; → ray; → shower.

cosmo-
  کیهان-   
keyhân- (#)

Fr.: cosmo-   

Combining form of → cosmos.

cosmos.

cosmogenic neutrino
  نوترینوی‌ ِ پرتو ِ کیهانی، ~ کیهانزاد   
notrino-ye partow-e keyhâni, ~ keyhânzâd

Fr.: neutrino cosmogénique   

A type of neutrino generated by → UHECRs during their journey from distant sources to the Earth. Also called → ultra high energy neutrino.

Constructed from cosmo-, from → cosmic rays + -genic, → cryogenic.

cosmogony
  کیهانزایش   
keyhânzâyeš

Fr.: cosmogonie   

A philosophical, religious, or mythical story of the creation or origin of the → Universe, usually referring to the → solar system.

From → cosmo- + -gony, from L. -gonia, from Gk. -goneia, from gonos, offspring; cf. Av. zan- "to bear, give birth to a child, be born," infinitive zizâite, zâta- "born," Pers. zâdan "give birth, be born", Skt. janati "begets, bears," Gk. gignesthai "to become, happen" L. gignere "to beget," gnasci "to be born," PIE base *gen- "to give birth, beget").

Keyhânzâyeš, from keyhân, → cosmo-, + zâyeš verbal noun from zâdan "be born; give birth," as above.

cosmography
  کیهاننگاری   
keyhânnegâri

Fr.: cosmographie   

The branch of → cosmology concerned with the dimensional structures of the → Universe and their measurement.

cosmo-; → -graphy.

cosmological
  کیهان‌شناختی، کیهان‌شناسیک   
keyhânšenâxti, keyhânšenâsik

Fr.: cosmologique   

Pertaining or relating to → cosmology.

cosmology; → -al.

cosmological constant
  پایای ِ کیهان‌شناسیک، ~ کیهان‌شناختی   
pâyâ-ye keyhânšenâsik, ~ keyhânšenâxti

Fr.: constante cosmologique   

A term introduced by Einstein into his gravitational → field equations in order to allow a solution corresponding to a → static Universe. The cosmological constant is physically interpreted as due to the → vacuum energy of quantized fields. See also → dark energy.

cosmological; → constant.

cosmological constant problem
  پراسه‌ی ِ پایای ِ کیهانشناختی   
parâse-ye pâyâ-ye keyhânšenâxti

Fr.: problème de la constante cosmologique   

The impressive discrepancy of about 120 orders of magnitude between the theoretical value of the → cosmological constant and its observed value. → Quantum field theory interprets the cosmological constant as the density of the → vacuum energy. This density can be derived from the maximum energy at which the theory is valid, i.e. the → Planck energy scale (1018 GeV). The theoretical vacuum → energy density is (1018 GeV)4 = (1027 eV)4 = 10112 erg cm-3. On the other hand, the observed vacuum energy density is estimated to be about (10-3 eV)4 = 10-8 erg cm-3. There is, therefore, a discrepancy of about 120 orders of magnitude.

cosmological; → constant; → problem.

cosmological distance
  دورای ِ کیهان‌شناسیک، ~ کیهان‌شناختی   
durâ-ye keyhânšenâsik, ~ keyhânšenâxti

Fr.: distance cosmologique   

The distance to a remote galaxy based on its redshift assuming that the redshift is caused by the → Doppler effect and reflects the general expansion of the Universe.

cosmological; → distance .

cosmological model
  مدل ِ کیهان‌شناسیک، ~ کیهان‌شناختی   
model-e keyhânšenâsik, ~ keyhânšenâxti

Fr.: modèle cosmologique   

A mathematical description of the Universe, based on observation, which tries to explain its current aspect, and to describe its evolution during time.

cosmological; → model.

cosmological principle
  پروز ِ کیهان‌شناسیک، ~ کیهان‌شناختی   
parvaz-e keyhânšenâsik, ~ keyhânšenâxti

Fr.: principe cosmologique   

The → hypothesis that on → large scales the → Universe is → isotropic and → homogeneous, that is, it appears the same at all places and, from any one place, looks the same in all directions. See also → perfect cosmological principle.

Introduced by E.A. Milne in 1933; → cosmological; → principle.

cosmological redshift
  سرخ کیب ِ کیهان‌شناسیک، ~ کیهان‌شناختی   
sorxkib-e keyhânšenâsik, ~ keyhânšenâxti

Fr.: décalage vers le rouge cosmologique, redshift ~   

The → redshift of a remote object (galaxy, quasar, supenova) due to the expansion of the Universe.

cosmological; → redshift.

cosmology
  کیهان‌شناسی   
keyhânšenâsi (#)

Fr.: cosmologie   

The science of the origin, structure, and evolution of the Universe including the origin of galaxies, the chemical elements, and matter.

Cosmology, from → cosmo- + → -logy.

Keyhânšenâsi, from keyhân, → cosmos, + šenâsi, → -logy.

cosmonaut
  کیهان نورد، فضا نورد   
keyhânnavard (#), fazânavard (#)

Fr.: cosmonaute, astronaute   

The Russian term for → astronaut.

Cosmonaut, from → cosmo- + naute, from Gk. nautes "sailor," from naus "ship" (cognate with Pers. nâv "ship," Av./O.Pers. *nāv-, O.Pers. nāviyā- "fleet," Skt. nau-, nava- "ship, boat," Gk. naus, neus, L. navis; PIE *nâu- "ship").

cosmos
  کیهان   
keyhân (#)

Fr.: cosmos   

Everything that exists anywhere; → outer space; → Universe.

M.E., from Gk. kosmos "orderly arrangement."

Keyhân "world," variants geyhân, jahân, giti "world, material world, time," Mid.Pers. gêhân, gêtig, Manichean Mid.Pers. gyh "world," Av. gaeθa- "being, world, matter, mankind", gaya- "life, manner of living," root gay- "to live" (present tense jiva-), O.Pers. gaiθā- "live-stock," cognate with Skt. jivah "alive, living," Gk. bios "life," L. vivus "living, alive," vita "life;" PIE base *gweie- "to live" (cf. O.E. cwic, "alive;" O.C.S. zivo "to live;" Lith. gyvas "living, alive;" O.Ir. bethu "life," bith "age;" Welsh byd "world"). The Persian terms zistan "to live," zendé "alive," zendegi "life," and jân "vital spirit, soul" belong to this family.

cotangent
  کوتانژانت   
kotânžânt (#)

Fr.: cotangent   

The → tangent of the complement of an arc or angle; abbreviation cot. If θ is an → acute angle of a → right angle, cot θ = (adjacent side)/(opposite side).

co-; → tangent.

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