- 産業: 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 ...
Group of asteroids with similar orbital elements (distance from the Sun, inclination of the orbital plane to the Earth's orbital plane, and eccentricity of the orbit) thought to be remnants of one larger asteroid parent.
Industry:Astronomy
Crack extending far into a planet or moon through which magma travels to and erupts onto the surface.
Industry:Astronomy
Intensive and prolonged impacts of a surface by meteorites or other impactors.
Industry:Astronomy
Rocks that have recrystallized in a solid state as a result of changes in temperature, pressure, and chemical environment.
Industry:Astronomy
Roughly spherical objects found in a type of meteorite called chondrites. Most chondrules are 0. 5 to 2 millimeters in size and are composed of olivine and pyroxene, with smaller amounts of glass and iron-nickel metal. The shapes of the mineral grains in them indicate that chondrules were once molten droplets floating freely in space.
Industry:Astronomy
A black, strongly magnetic iron-oxide mineral; Fe<sub>3</sub>O<sub>4</sub>.
Industry:Astronomy
Instrument that produces and measures, usually by electrical means, a mass spectrum. It separates ions according to the ratio of their mass to charge, allowing scientists to determine the abundances of each isotope.
Industry:Astronomy
Energy derived from the Sun or sunlight for use as a source of electricity.
Industry:Astronomy
