- 産業: Astronomy
- Number of terms: 6727
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Planetary Science Research Discoveries (PSRD) is an educational site sharing the latest research by NASA-sponsored scientists on meteorites, asteroids, planets, moons, and other materials in our Solar System. The website is supported by the Cosmochemistry Program of NASA's Science Mission ...
Un élément de numéro atomique 2 ; symbole : il. C'est l'élément plus fréquent dans le soleil et les planètes extérieures, mais rares sur les planètes rocheuses.
Industry:Astronomy
Un trou ou une dépression. La plupart sont à peu près circulaire ou ovale au contour. Sur terre, les cratères plus naturels sont d'origine volcanique. Sur la lune, la plupart sont d'origine de l'impact.
Industry:Astronomy
Un grand cercle imaginaire dans le ciel attiré concentrique à l'Équateur terrestre.
Industry:Astronomy
Enlèvement de roches altérées par mouvement eau, vent, glace ou la gravité.
Industry:Astronomy
The fundamental unit of temperature. It is not calibrated in terms of the freezing and boiling points of water, but in terms of energy itself. The number 0 K is assigned to the lowest possible temperature, called absolute zero. The sizes of the "degree" are the same as on the Celsius scale. On the Kelvin scale, the freezing point of water is 273 K and the boiling point is 373 K.
Industry:Astronomy
Partie invisible du spectre lumineux où les longueurs d'onde sont plus courtes que le spectre visible et plus de rayons X.
Industry:Astronomy
MgAl<sub>2</sub>O<sub>4</sub>, magnesium aluminum oxide mineral, with Cr able to substitute for Al.
Industry:Astronomy
The region of "altered space" that will interact with the magnetic properties of a magnet. It is located mainly between the opposite poles of a magnet or in the energetic space about an electric charge in motion.
Industry:Astronomy
