- Settore: 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 ...
Consolidated, fragmental rock consisting of rock, mineral, or glass fragments (also called clasts) embedded in a fine-grained matrix. (See also monomict and polymict. )
Industry:Astronomy
Pertaining to carbon-containing compounds. Organic compounds can be formed by both biological and non-biological processes.
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A star in the process of formation which has not yet become hot enough in the core to initiate the process of nuclear fusion (10<sup>7</sup> K) to halt its gravitational collapse.
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An imaginary sphere centered on the Earth, or arbitrary large radius on the surface of which the stars are considered to be fixed.
Industry:Astronomy
The relationship of a distance on a map or model to the true distance in space; written as a ratio, such as 1:24,000.
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Unit of measure that is one-billionth of a meter. A nanometer-sized particle is smaller than a living cell and can only be seen with the most powerful microscopes.
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A constant value: 299,792,458 meters per second (186,282 miles per second).
Industry:Astronomy
Apparent motion of a nearby object as projected against more distant background objects due to the motion of the observer.
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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
