- 行业: 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 ...
Opaque mineral found in basalt; nearly pure iron-titanium oxide (FeTiO<sub>3</sub>. )
Industry:Astronomy
A common class of achondrite meteorites composed of pigeonite and plagioclase. These meteorites formed as basaltic flows on a parent body, probably asteroid 4 Vesta.
Industry:Astronomy
United States federal agency. "NASA is an investment in America's future. As explorers, pioneers, and innovators, we boldly expand frontiers in air and space to inspire and serve America and to benefit the quality of life on Earth. " -from the NASA Strategic Plan.
Industry:Astronomy
An internal property of a fluid that offers resistance to flow. If a fluid has a high viscosity, then it strongly resists flow. An example of a low viscosity fluid is water.
Industry:Astronomy
Term describing high contents of dark-colored, magnesium-rich and iron-rich minerals.
Industry:Astronomy
Distance that light can travel in 1 year. Light travels at a speed of 300,000 km / sec, so this distance is equal to 9. 46 x 10<sup>12</sup> kilometers.
Industry:Astronomy
A tabular, parallel-sided sheet of igneous rock, formed underground, that is parallel to the layered rocks around it.
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
The ratio of magnesium to iron, usually reported as the molar ratio Mg/(Mg+Fe), and abbreviated as Mg# or Mg' or Mg*. This value is used commonly to discriminate between lunar rock types.
Industry:Astronomy
Term referring to the idea that a sharp increase in impact bombardment rate between about 3. 92 and 3. 85 billion years ago affected the inner Solar System--most notably recorded in the numerous craters and large basins on the Moon.
Industry:Astronomy
