- Settore: 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 ...
В центральной части планеты или Луны часто изготовлены из плотной материалов чем прилегающих регионов (мантии и коры). Считается, что Земля и Луна имеют ядер железа и никеля.
Industry:Astronomy
Полный спектр частот, от радиоволн до гамма-лучей, что характеризует свет. Электромагнитного спектра могут быть выражены с точки зрения энергии, длины волны или частоты (где длина волны равна скорости света разделили по частоте и энергии равна постоянная Планка раз частоты.)
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
Conventional unit of pressure when discussing the deep Earth: 1 GPa = 10 kilobars = 10,000 times air pressure at sea level.
Industry:Astronomy
One of the three types of meteorites from Mars (the SNC meteorites). The type is named after the Shergotty meteorite, which fell in India in 1865. Basaltic shergottites consist mainly of plagioclase and pyroxenes. They are fine-grained and probably formed as volcanic lava flows or shallow intrusions. Lherzolitic shergottites are related to the basaltic shergottites but are coarser grained, have larger amounts of olivine, and are considered to be cumulate rocks.
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
An igneous rock made up almost entirely of plagioclase feldspar. This rock dominates the lunar highlands.
Industry:Astronomy
An imaginary great circle in the sky drawn concentric to the Earth's equator.
Industry:Astronomy
