- Отрасли: 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 ...
El patrón de la abundancia relativa de los iones de diferentes masas atómicas o moleculares (masa para cargar cociente) dentro de una muestra. Con frecuencia se refiere a las medida abundancias relativas de los isótopos de un elemento.
Industry:Astronomy
Un elemento con número atómico 2; símbolo: él. Es el elemento más común en segundo lugar en el sol y los planetas, pero rara en los planetas rocosos.
Industry:Astronomy
Buried mare basalt lavas on the Moon. Many light plains in the lunar highlands have impact craters surrounded by dark piles of ejecta, nicknamed "dark-haloed craters. " The dark-haloed craters formed when mare basalt lava flows were covered with ejecta from large impact craters and basins, and then small craters punctured through the ejecta to toss out mare basalt.
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
Una roca ígnea compuesta casi en su totalidad de feldespato plagioclasa. Esta roca domina las alturas lunares.
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
Procesos que cambian la estructura física, propiedades ópticas o propiedades químicas o mineralógicas de la superficie de un cuerpo planetario airless de su estado original. Estos procesos incluyen bombardeo de meteoritos, micrometeoritos y polvo cósmico, implantación de iones del viento solar y la farfulla, en vacío profundo y temperaturas acercándose a cero absoluto (-273 ° C).
Industry:Astronomy
