An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13048 Search : far
Dysnomia (136199 Eris I)
  دوسنمیا   
Dusnomiya (#)

Fr.: Dysnomia   

A → satellite of the → dwarf planet → Eris.

Dysnomia in Gk. mythology is the daughter of Eris and the goddess of lawlessness.

Dyson shell
  پوسته‌ی ِ دایسون   
puste-ye Dyson

Fr.: couche de Dyson   

Dyson sphere.

Dyson; → shell.

Dyson sphere
  سپهر ِ دایسون   
sepehr-e Dyson

Fr.: sphère de Dyson   

A hypothetical structure built around a → star by an advanced → civilization to utilize most or all of the → energy radiated by their star. The idea of such a sphere was first formalized and popularized by theoretical physicist Freeman Dyson in 1960, though it was originally put forward by a 1945 science fiction novel. Dyson assumed that the power needs of → intelligent civilizations never stops increasing. He also proposed that searching for the existence of such structures might lead to the discovery of advanced civilizations elsewhere in the Galaxy. Sometimes referred to as a → Dyson shell or → megastructure.

Freeman John Dyson (1923-). His article, entitled "Search for Artificial Stellar Sources of Infrared Radiation," appeared in the 1960 issue of Science, 131 (3414), 1667-1668; → sphere.

DZ white dwarf
  سفید‌کوتوله‌ی ِ DZ   
sefid kutule-ye DZ

Fr.: naine blanche DZ   

A → white dwarf whose spectrum shows metal lines only; no H or He.

D short for → dwarf; Z a convention; → white.

E corona
  تاج ِ E   
tâj-e E

Fr.: couronne E   

A part of the → solar corona defined by the → emission lines of hot gases. These emission lines include the so-called → forbidden lines of the strongly ionized atoms of iron, calcium, and other elements. The E corona is thinner than the → K corona and the → F corona (M.S.: SDE).

E indicating → emission; → corona.

E ring
  حلقه‌ی ِ E   
halqe-ye E

Fr.: anneau E   

The → Saturn's ring, with a width of 300,000 km, lying beyond the → G ring, at 180,000-480,000 km from the center of Saturn.

ring.

E-ELT
     
E-ELT

Fr.: E-ELT   

The world's largest → optical and → near infrared telescope, with a diameter of 42 m, to be built by the → European Southern Observatory (ESO). → First light is foreseen for 2018. The telescope has an innovative five-mirror design that includes advanced → adaptive optics to correct for the → atmospheric turbulence, giving exceptional → image quality. The → primary mirror will consist of almost 1000 hexagonal segments each 1.4 m across. The → secondary mirror will be 6 m in diameter. The E-ELT will collect 15 times more light than the largest optical telescopes operating today.
On 26 April 2010, the ESO Council selected Cerro Armazones as the baseline site for the E-ELT. Cerro Armazones is a mountain at an altitude of 3060 m in the central part of Chile's Atacama Desert, some 130 km south of the town of Antofagasta and about 20 km from Cerro Paranal, home of ESO → Very Large Telescope.

Short for the European Extremely Large Telescope

e-folding time
  زمان ِ e-تایی   
zamân-e e-tâyi

Fr.:   

The time within which the amplitude of an oscillation increases or decreases by a factor e (= 2.71828...).

From e the base of the natural, or Napierian, system of logarithms; folding, from -fold suffix meaning "of so many parts," or denoting multiplication by the number indicated by the stem or word to which the suffix is attached (as in twofold; manifold), from O.E. -feald, related to Ger. -falt; Gk. altos, -plos, -plus; → time.

Zamân, → time; e, as above; tâyi noun of multiplicative suffix, also "fold, plait, wrinkle; like, resembling."

e-mail
  پَیِل   
payel

Fr.: mél, courriel   

1) A system for sending → messages from one individual to another via telecommunications links between → computers or → terminals using dedicated → software.
2) A message sent by email (Dictionary.com).

From electronic, → electronic, + mail, from M.E. male, from O.Fr. male "wallet, bag," of Germanic source; cf. O.H.G. malaha "wallet, bag," M.Du. male "bag;") from PIE *molko- "skin, bag."

Payel, contraction of payâm-e elelktronik "electronic message," from payâm, → message, + elektronik, → electronic; cf. Fr. mél "e-mail," from message + électronique, or courriel "e-mail," from courrier + électronique.

E-mode polarization
  قطبش ِ ترز ِ E   
qotbeš-e tarz-e E

Fr.: polarisation en mode E   

A → polarization component in the → cosmic microwave background radiation that depends only on → gradient, is independent of → curl and does not have → handedness. In contrast to the → B-mode, the E-mode may be due to both the → scalar perturbations and → tensor perturbations.

E, indicating electric-field like; → mode; → polarization.

e-term of aberration
  بیراهش ِ ترم ِ e   
birâheš-e tarm-e e

Fr.: aberration elliptique   

The same as → elliptic aberration.

e, → elliptic; → term; → aberration.

E-type chondrite
  کوندریت ِ گونه‌ی ِ E   
kondrit-e gune-ye E

Fr.: chondrite de type E   

Same as → enstatite chondrite.

enstatite; → type; → chondrite.

Eagle Nebula (IC 4703)
  میغ ِ شاهین   
Miq-e Šâhin

Fr.: Nébuleuse de l'Aigle   

A prominent → H II region in the constellation → Serpens lying about 2 kpc away from the Sun. It measures about 30' across and surrounds the open cluster → M16 (NGC 6611), which contains at least 20 stars of spectral type B0.5 or earlier, including one 05V. At a projected distance from the cluster of about 2 pc, where the H II region has expanded into surrounding → molecular cloud, a striking → elephant trunk morphology or → pillar results. The nebula is the site of ongoing → star formation, especially in these pillar structures. The Eagle Nebula is often erroneously given the cluster's designation (M16).

Eagle, because the nebula's shape is vaguely reminiscent of an eagle in flight; from M.E. egle, from O.Fr. egle, from O.Prov. aigla, from L. → aquila "black eagle;" → nebula.

Miq, → nebula; Šâhin, → aquila.

ear
  گوش   
guš (#)

Fr.: oreille   

The vertebrate organ of hearing, which is also responsible for maintaining equilibrium. It is usually composed of three parts: the outer ear, middle ear, and inner ear.

M.E. ere, O.E. eare "ear" (O.N. eyra, Dan. øre, M.Du. ore, Du. oor, O.H.G. ora, Ger. Ohr); cf. Gk. aus; L. auris; Av. usi "both ears;" Lith. ausis; O.C.S. ucho; O.Ir. au; PIE *ous-.

Guš "ear" (gušidan "to hear," niyušidan "to listen"); Mid.Pers. gôš "ear," gôšidan "to hear, listen;" O.Pers. gauša-; Av. gaoša- "ear," gaoš- "to hear;" cf. Skt. ghosa- "noise, tumult," ghus- "to sound, cry or proclaim aloud;" PIE *ghous-.

early
  آغازین   
âqâzin (#)

Fr.: précoce; jeune   

Occurring at or near the beginning of a period of time, process, or sequence of events.

M.E. erlich (adj.), erliche (adv.); O.E. ærlice, from ær "soon, ere" (from P.Gmc. *airiz, from PIE *āier- "day, morning," cf. Av. ayar- "day, day time," ayarə.drājah- "duration of one day," ayarə.bara- "day's ride," Mid/Mod.Pers. parēr "the day before yesterday," from *parā.ayer- "the day before") + -lice "-ly," adverbial suffix.

Âqâzin adj. of âqâz "beginning," from Proto-Iranian *āgaHz-, from prefix ā- + *gaHz- "to run, start," cf. Sogdian āγāz "beginning, start" (Cheung 2007).

early AGB phase
  فاز ِ AGBی ِ آغازین   
fâz-e AGB-ye âqâzin

Fr.: phase initiale de l'AGB   

A fairly long-lived step in the evolution of → low-mass and → intermediate-mass stars when helium burning shifts from the center to a shell around the core. At this phase the stellar luminosity is provided almost entirely by → helium shell burning. The He-shell burning generally adds mass to the growing carbon/oxygen core, resulting in → degenerate matter due to its increasing density.

early; → AGB; → phase.

early solar system
  راژمان ِ خورشیدی ِ آغازین   
râžmân-e xoršidi-ye âqâzin

Fr.: système solaire primordial   

A period in the evolution of the → solar system when the planets and satellites were in the process of formation.

early; → solar; → system.

early spectral class star
  ستاره با رده‌ی ِ بینابی ِ آغازین   
setâré bâ rade-ye binâbi-ye âqâzin

Fr.: étoile de type spectral précoce   

A star near the beginning of the → spectral classification sequence. A star of → spectral type O, B, A, or F0 to F5. Same as → early-type star.

early; → spectral; → class; → star.

early Universe
  گیتی ِ آغازین   
giti-ye âqâzin (#)

Fr.: Univers jeune   

A qualitative term used to describe a phase in the history of the Universe, from the → Big Bang event to the apparition of the first structures (seeds of future galaxies), at a → redshift around 30.

early; → universe.

early-type galaxy (ETG)
  کهکشان ِ گونه‌ی ِ آغازین   
kahkešân-e gune-ye âqâzin

Fr.: galaxie de type précoce   

In the → Hubble classification, galaxies on the left part of the → Hubble sequence. Early-type galaxies tend to have redder colors, higher average surface brightnesses, and lower → neutral hydrogen content than → late-type galaxies. This terminology is based on the obsolete and erroneous idea that → elliptical and → lenticular galaxies might be evolutionary precursors to → spiral and → barred spiral galaxies.

early; → type; → galaxy.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu Coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima Ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad ran rar ray rea rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>