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HIT THEORY [4 records]

Record 1 2022-05-16

English

Subject field(s)
  • Various Proper Names
  • Planets
  • Space Physics
CONT

Scientists have proposed many ideas for how the Moon formed. A leading contender, the Giant Impact theory, speculates that when Earth was a young planet and just beginning to form, it was hit by another emerging planet named Theia, located nearby.

French

Domaine(s)
  • Appellations diverses
  • Planètes
  • Physique spatiale
CONT

[...] quelques dizaines de millions d'années après la formation de la Terre, une petite planète de la taille de Mars (6.500 km de diamètre), baptisée Théia en souvenir de la divinité grecque mère d'Hélios (le Soleil) et de Séléné (la Lune), aurait heurté la Terre. L'impact se serait fait tangentiellement, arrachant une partie du manteau terrestre. La violence du choc aurait conduit à la fragmentation complète et à une vaporisation importante de ce corps céleste.

Spanish

Save record 1

Record 2 2022-03-11

English

Subject field(s)
  • Astrophysics and Cosmography
  • Space Physics
CONT

Scientists have proposed many ideas for how the Moon formed. A leading contender, the Giant Impact theory, speculates that when Earth was a young planet and just beginning to form, it was hit by another emerging planet named Theia, located nearby. The collision caused both planets to temporarily splatter apart into globs of gas, magma, and chemical elements before reforming into the bodies we know today to be the Earth and Moon.

Key term(s)
  • Theia impact
  • Big Splash
  • Big Splash theory

French

Domaine(s)
  • Astrophysique et cosmographie
  • Physique spatiale
Key term(s)
  • impact géant

Spanish

Save record 2

Record 3 2008-12-19

English

Subject field(s)
  • Biophysics
  • Radiological Physics (Theory and Application)
  • Biotechnology
DEF

A theory explaining some biological effects of radiation on the basis that ionization, which occurs in a discrete volume (the target) within the cell, directly causes a lesion that later results in a physiological response to the damage at that location.

OBS

One, two or more hits (ionizing events within the target) may be necessary to elicit the response.

French

Domaine(s)
  • Biophysique
  • Physique radiologique et applications
  • Biotechnologie
CONT

[La théorie de la cible] suppose que, dans chaque cellule, il existe des volumes cibles sublétaux dont l'atteinte par un rayonnement ionisant entraîne la mort cellulaire, et que chaque dose délivrée est indépendante de la précédente.

Spanish

Campo(s) temático(s)
  • Biofísica
  • Física radiológica (Teoría y aplicación)
  • Biotecnología
Save record 3

Record 4 2000-10-24

English

Subject field(s)
  • Missiles and Rockets
CONT

The US Air Force has delivered to Defense Secretary Caspar Weinberger its latest proposal for basing 100 MX intercontinental ballistic missiles in the western United States. Unlike previous proposals, this plan calls for the missiles to be closely spaced in a deployment strategy nick-named Dense Pack. In this scheme, the missile silos are super-hardened and placed about 700 m apart. The theory is that the silos would withstand anything but a direct hit and that the phenomenon known as fratricide among incoming enemy warheads would mean that there would be very few direct hits.

OBS

closely spaced basing; Dense Pack: terms extracted from the "Disarmament and Peace Keeping" glossary with the permission of the United Nations Office at Geneva.

French

Domaine(s)
  • Missiles et roquettes
CONT

Déploiement des missiles MX - le projet Dense Pack. L'US Air Force a remis à M. Caspar Weinberger, secrétaire américain à la Défense, une nouvelle proposition relative à l'implantation d'une centaine de missiles intercontinentaux de type MX dans l'ouest des États-Unis. Contrairement aux projets précédents, celui-ci prévoit d'aménager les missiles dans des silos espacés seulement de quelque 700 m (d'où la désignation «Dense Pack») et capables de résister à une explosion nucléaire, sauf en cas d'impact direct. On estime en effet que le phénomène dit «de destruction fratricide» dans les vagues de missiles ennemis diminuerait fortement les risques de coup au but.

OBS

groupement serré; positionnement dans un espace réduit : termes tirés du lexique «Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

Spanish

Save record 4

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