- Industry: 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 ...
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
Angle between the plane of the object's orbit and the ecliptic (defined by Earth's orbit).
Industry:Astronomy
The time when the Sun is 6-12 degrees below the horizon. Sky begins to get noticeably bright.
Industry:Astronomy
An opening in the Earth's surface (or other planet or moon) through which lava, gases, and hot particles come out.
Industry:Astronomy
The glassy, melted rind on a meteorite that forms when the rock passes through the Earth's atmosphere.
Industry:Astronomy
Low-angle fault in which rock above the fault plane moves up in relation to rock below.
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
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
