- 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 ...
In astronomy, the first time a periodic comet is observed on its inbound journey toward perihelion. In meteoritics, the collection of a meteorite after its fall.
Industry:Astronomy
An enormously bright, energetic, catastrophic explosion that occurs at the end of the lifetime of a massive star whose core collapses. A star must have at least nine times the mass of the Sun to undergo a core-collapse supernova. The extreme heat generated by the explosion makes elements heavier than iron, this is called supernova nucleosynthesis. See also r-process and s-process, and stellar nucleosynthesis.
Industry:Astronomy
A meteorite that was observed as it fell through Earth's atmosphere and was retrieved. Since most falls are collected soon after hitting the ground, these meteorites are not badly degraded or weathered.
Industry:Astronomy
Fragments of older material (e. G. Minerals, rock) that have been enclosed within another rock.
Industry:Astronomy
An element with atomic number 16; symbol: S. Sulfur is common on the surface of Jupiter's moon Io.
Industry:Astronomy
A point on the surface of a sphere that is located diametrically opposite another point. For example, on the Earth the antipode of Hawaii is Botswana. The term is used commonly in lunar geology to describe locations on the Moon in relation to impact basins. Researchers have hypothesized that accumulations of converged ejecta materials, production of impact shock stresses, anomalies in lunar crustal magnetic fields, and geochemical anomalies are associated with antipodes of basins.
Industry:Astronomy
A hole or depression. Most are roughly circular or oval in outline. On Earth most natural craters are of volcanic origin. On the Moon most are of impact origin.
Industry:Astronomy
The buildup of heavy isotopes inside massive stars by the rapid (hence the use of "r") absorption of neutrons by atomic nuclei. See also s-process and supernova.
Industry:Astronomy
The glassy, melted rind on a meteorite that forms when the rock passes through the Earth's atmosphere.
Industry:Astronomy
In astronomy, a comet with an orbital period greater than 200 years.
Industry:Astronomy
