- Отрасли: 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
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
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
An element with atomic number 7; symbol: N. It is common in Earth's atmosphere and along with hydrogen, carbon, and oxygen is essential for life.
Industry:Astronomy
Single-celled microorganisms whose cells lack a nucleus. Bacteria comprise a major domain of life called prokaryotes. In contrast, the cells in eukaryotes have a well-defined nucleus; eukarya include molds, plants, and animals. Another major domain is called archaea, microorganisms with genetic features distinct from prokarya and eukarya. Most methane-producing bacteria are actually archaea, but for simplicity many biologists informally refer to all non-eukaryotes as "bacteria. "
Industry:Astronomy
The central region of a planet or moon frequently made of denser materials than the surrounding regions (mantle and crust). Earth and the Moon are thought to have cores of iron and nickel.
Industry:Astronomy
