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: 304 Search : act
impact event
  رویداد ِ برخورد   
ruydâd-e barxord

Fr.: impact cosmique   

A collision between two celestial objects, specially solar system bodies, with considerable consequences. Impact events involve release of large amounts of energy. Some examples are the 1908 Siberian → Tunguska event by a → comet, the → Barringer Crater, and the collision of an → asteroid with Earth 65 million years ago, which is thought to have led to the extinction of the dinosaurs and other species of the → Cretaceous-Paleogene period.

impact; → event.

impact hazard
  آپه‌ی ِ برخورد   
âpe-ye barxord

Fr.: risque d'impact   

The danger of collision with Earth posed by solar system small bodies that pass near our planet. These objects include → near-Earth asteroids and nuclei of → comets. See also: → near-Earth object, → impact crater, → Torino scale, → Palermo scale, → Space Situational Awareness.

impact; → hazard.

impact ionization
  یونش ِ برخوردی   
yoneš-e barxordi

Fr.: ionisation par collision   

The loss of orbital electrons by an atom of a crystal lattice which has undergone a high-energy collision.

impact; → ionization.

impact parameter
  پارامون ِ برخورد   
pârâmun-e barxord

Fr.: paramètre d'impact   

1) A measure of the distance by which a collision fails being frontal.
2) In → gravitational lensing, the distance of closest approach of the light path to the → lensing object.
3) In → rainbows, the displacement of the → incident from an axis that passes through the center of the water droplet.

impact; → parameter

impact winter
  زمستان ِ برخورد   
zemestân-e barxord

Fr.: hiver par impact   

The enormous drop in temperature and the related effects of the shrouding of Earth with soot and dust particles after the planet is struck by a sizable comet or asteroid. Such a phenomenon is believed to have killed off the dinosaurs 65 million years ago.

impact; → winter.

impactite
     
impaktit, barxordit

Fr.: impactite   

A general term used for all rocks affected by, or produced by, the → shock waves and other processes generated by hypervelocity → meteorite → impact events. Impactites occur in and around the → impact crater, typically as individual bodies composed of mixtures of melt and rock fragments, often with traces of meteoritic material.

impact; → -ite.

impactor
  برخوردگر   
barxordgar

Fr.: impacteur   

A natural impacting body, such as a comet, asteroid, or planet. It can also be a space probe designed to collide with an astronomical body in the solar system.

Impactor, from → impact + -or a suffix forming agent nouns.

Barxordgar, from barxord, → impact, + -gar agent suffix, from kar-, kardan "to do, to make" (Mid.Pers. kardan, O.Pers./Av. kar- "to do, make, build," Av. kərənaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make").

inactive
  ناژیرا   
nâžirâ

Fr.: inactif   

1) Not → active.
2) Chem.: Not → reactive.

in-; → active.

index of refraction
  دیشن ِ شکست   
disšan-e šekast

Fr.: indice de réfraction   

Same as → refractive index.

index; → refraction.

integrating factor
  کروند ِ درستالنده   
karvand-e dorostâlandé

Fr.: facteur intégrant   

A function that converts a → differential equation, which is not exact, into an → exact differential equation. This is done by multiplying all terms of the original equation by the integrating factor.

integrate; → factor.

interact
  اندرژیریدن   
andaržiridan

Fr.: interagir   

To act upon one another; have a mutual or reciprocal action.

Interact, from → inter- + → act.

interacting binary
  دورین ِ اندرژیرنده   
dorin-e andaržirandé

Fr.: binaire en interaction   

A binary star system in which mass transfer between the components takes place. → contact binary; → Roche lobe.

Interacting, adj. of → interact; → binary.

interacting galaxies
  کهکشان‌های ِ اندرژیرنده   
kahkešânhâ-ye andaržandé

Fr.: galaxies en interaction   

Galaxies that are close enough for their mutual gravitational attraction to produce perturbed shapes or extruded filaments of stellar material, called → tidal tails. Most galaxies are in clusters, and gravitational interactions between them are common.

Interacting, adj. of → interact; → galaxy.

interaction
  اندرژیرش   
andaržireš

Fr.: interaction   

General: Mutual or reciprocal action or influence.
Physics: 1) What happens between a system and its surroundings when an observable change in one corresponds to or correlates with an observable change in the other.
2) The natural phenomenon of the transfer of energy between two particles. The four known kinds of interactions, in the order of increasing strength, are: → gravitational, → weak, → electromagnetic, and → strong.

Interaction, from → inter-; + → action.

interactional
  اندرژیرشی   
andaržireši

Fr.:   

Capable of acting on or influencing each other

From → interaction; + → -al.

interactive
  اندرژیری   
andaržiri

Fr.: interactif   

1) Acting one upon or with the other.
2) Computers: Of or pertaining to a system or program that maintains an exchange with the user, alternately accepting input and then responding.

inter-; → active.

intergalactic
  اندرکهکشانی   
andarkahkešâni

Fr.: intergalactique   

Of, existing, or occurring in the space between galaxies. → intergalactic absorption, → intergalactic cloud, → intergalactic matter , → intergalactic medium , → warm-hot intergalactic medium.

inter-; → galactic.

intergalactic absorption
  درشم ِ اندرکهکشانی   
daršam-e andarkahkešâni

Fr.: absorption intergalactique   

Absorption features in the spectra of bright sources like → quasars attributed to a tenuous matter filling the medium between galaxies.

intergalactic; → absorption.

intergalactic cloud
  ابر ِ اندرکهکشانی   
abr-e andarkahkešâni

Fr.: nuage intergalactique   

Intergalactic matter in the form of clouds.

intergalactic; → cloud.

intergalactic matter
  مادّه‌ی ِ اندرکهکشانی   
mâdde-ye andarkahkešâni

Fr.: matière intergalactique   

Very low density material found indirectly in the space between galaxies. → intergalactic absorption.

intergalactic; → matter.

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