Fr.: quantificateur existentiel
A symbol of → predicate logic which expresses that the statements within its scope are → true for at least one instance of something. The symbol ∃ is used as the existential quantifier. Existential quantifiers are normally used in logic in → conjunction with → predicate symbols, which say something about a → variable or → constant, in this case the variable being quantified (→ quantify, → quantification).
A philosophical attitude associated especially with Heidegger, Jaspers, Marcel, and Sartre, and opposed to → rationalism and → empiricism, that stresses the individual's unique position as a self-determining agent responsible for the authenticity of his or her choices (Dictionary.com).
An advocate of → existentialism.
A way or passage out.
From L. exit "he or she goes out," from exire "to go out," from → ex- "out" + ire "to go;" cf. Gk ion " going," neut. pr.p. of ienai "to go;" Pers. ây-, â- present stem of âmadan "to come;" O.Pers. aitiy "goes;" Av. ay- "to go, to come," aēiti "goes;" Skt. e- "to come near," eti "arrival;" Goth. iddja "went," Lith. eiti "to go;" Russ. idti "to go."
Fr.: pupille de sortie
Prefix meaning "outside; outer; external" used in the formation of compound words: exoplanet, exosphere, exocentric.
From Gk. exo "outside," used in forming scientific terms, → ex-.
Borun-, from borun "out, the outside" (Mid.Pers. bêron, from bê "outside, out, away" + rôn "side, direction;" Av. ravan- "(course of a) river").
The study of life beyond the Earth's atmosphere, as on other planets; also → astrobiology.
An → exoplanet similar to Earth.
Fr.: vie extraterrestre
A → European Space Agency (ESA) program to investigate the Martian environment and to demonstrate new technologies paving the way for a future Mars sample return mission in the 2020's. Two missions are foreseen: one consisting of an Orbiter plus an Entry, Descent and Landing Demonstrator Module (EDM), launched in 2016, and the other, featuring a rover, with a launch date of 2018. Both missions will be carried out in cooperation with Russia's Roscosmos space agency. The ExoMars program will demonstrate a number of essential flight and in-situ enabling technologies that are necessary for future exploration missions, such as an international Mars Sample Return mission. At the same time, a number of important scientific investigations will be carried out. The 2016 mission included a Trace Gas Orbiter (TGO) and an EDM. The Orbiter will carry scientific instruments to detect and study atmospheric trace gases, such as methane. The EDM will contain sensors to evaluate the lander's performance as it descends, and additional sensors to study the environment at the landing site. The 2018 mission includes a rover that will carry a drill and a suite of instruments dedicated to exobiology and geochemistry research.
Same as → extrasolar planet.
Of, relating to, or resembling an → exoplanet or exoplanets.
Fr.: système exoplanétaire
1) The outermost portion of the Earth's → atmosphere.
Extremely tenuous, it lies above the → ionosphere
from a height of about 500 km, to the edge of
→ interplanetary space.
Relating to or describing any process in which a system releases heat to its surrounding environment.
From garmâ "heat, warmth" (Mid.Pers. garm; O.Pers./Av. garəma- "hot, warm;" cf. Skt. gharmah "heat;" Gk. thermos "warm;" L. formus "warm;" P.Gmc. *warmaz; O.E. wearm; O.H.G., Ger. warm; PIE *ghworm-/*ghwerm-, as above) + zâ verbal adj. and agent noun of zâdan "to bring foth, give birth," (Mid.Pers. zâtan; Av. zan- "to bear, give birth to a child, be born," infinitive zazâite, zâta- "born;" cf. Skt. janati "begets, bears;" L. gignere "to beget;" PIE base *gen- "to give birth, beget").
1) Of foreign origin or character; not native; introduced from abroad,
but not fully naturalized or acclimatized.
M.E., from M.Fr. exotique and directly from L. exoticus, from Gk. exotikos "foreign," literally "from the outside," from → exo- "outside."
Fr.: étoile exotique
A hypothetical → compact object composed of particles other than electrons, protons, and neutrons balanced against → gravitational collapse by → degeneracy pressure of corresponding quantum properties.
Fr.: se dilater; développer; s'étendre; élargir
1) To increase in extent, size, volume, scope, etc.
From M.E. expanden, from L. expandere "to spread out," from → ex- "out" + pandere "to spread."
Gostardan "to expand; to spread; to diffuse," from Mid.Pers. wistardan "to extend; to spread;" Proto-Iranian *ui.star-; Av. vi- "apart, away from, out" (O.Pers. viy- "apart, away;" cf. Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + Av. star- "to spread," starati "spreads" (cf. Skt. star- "to spread out, extend, strew," strnati "spreads;" Gk. stornumi "I spread out," strotos "spread, laid out;" L. sternere "to spread;" Ger. Strahlung "radiation," from strahlen "to radiate," from Strahl "ray;" from M.H.G. strāle; from O.H.G. strāla "arrow," stripe; PIE base *ster- "to spread").
Expanded Very Large Array (EVLA)
A → radio interferometer array consisting of 27 25-meter diameter antennas located on the Plains of San Agustin in West-Central New Mexico. EVLA will operate at any frequency between 1.0 and 50 GHz and will have a continuum sensitivity improvement over the → VLA by factors of 5 to 20.The EVLA project is expected to be completed in 2012. See also the EVLA homepage.