- 産業: Astronomy
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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 ...
The full range of frequencies, from radio waves to gamma rays, that characterizes light. The electromagnetic spectrum can be expressed in terms of energy, wavelength, or frequency (where the wavelength equals the speed of light divided by the frequency and energy equals Planck's constant times the frequency. )
Industry:Astronomy
An abundant class of stony meteorites with chemical compositions similar to that of the Sun and characterized by the presence of chondrules. Chondrites come from asteroids that did not melt when formed and are designated as H, L, LL, E, or C depending on chemical compositions. The H, L, and LL types are called ordinary chondrites. The L chondrites are composed of silicate minerals (mostly olivine and pyroxene, but feldspar as well), metallic nickel-iron, and iron sulfide (called troilite). Most L chondrites are severely shocked-damaged, probably by a large impact on the asteroid in which they formed. The E type are called enstatite chondrites, a rare type that formed under very reducing conditions and are composed primarily of a magnesium silicate called enstatite. They are subdivided into the low-iron (EL) chemical group and the high-iron (HL) group. The C (or carbonaceous) chondrites contain water-bearing minerals and carbon compounds including a variety of organic molecules such as amino acids. Carbonaceous chondrites are the most primitive meteorites--primitive in a chemical way. For example, the CI group of carbonaceous chondrites are closest in composition to the photosphere (visible surface) of the Sun.
Industry:Astronomy
The description of the physical characteristics of rocks including color, mineral compositions, grain sizes, grain shapes, texture or fabric (relationship between grains).
Industry:Astronomy
Prostor između orbita Marsa i Jupitera (2.1 AJ - 3.3 AJ) koji karakteriše prisustvo velikog broja asteroida
Industry:Astronomy
Elements that are not incorporated into common rock-forming minerals during magma crystallization, hence they become enriched in the residual magma and in the rocks finally formed from it. Examples are: potassium, rubidium, strontium, hafnium, thorium, uranium, and lanthanum, samarium, europium, and the rest of the rare earth elements (REE).
Industry:Astronomy
The plane of a planet's orbit (or other Solar System object) is usually tilted with respect to the plane defined by the Solar System (the ecliptic). These 2 great circles intersect at 2 points. As the planet travels around its orbit, at one of the intersection points it will pass from below the ecliptic plane to above it (i. E. Northward). This point is called the ascending node.
Industry:Astronomy
Term applied to molten rock in the interior of a planet or moon. When it reaches the surface, magma is called lava.
Industry:Astronomy
U. S. Mission consisting of two spacecraft launched in 1977 to explore Jupiter, Saturn, Uranus, Neptune, and their moons, rings, and magnetic environments. It took 2 years for the crafts to reach Jupiter. The last image was taken in 1989 and now both crafts are headed for the outer Solar System.
Industry:Astronomy
