- 行业: 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 ...
Apparent motion of a nearby object as projected against more distant background objects due to the motion of the observer.
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
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 appearance; in astronomy, the period of observation of a returning periodic comet.
Industry:Astronomy
The smallest distance at which a planetary object that has no internal strength can orbit another body without being torn apart by the larger body's gravitational force.
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
A class of stony meteorites that crystallized from magmas. The term means without chondrules.
Industry:Astronomy
