- 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 ...
Термін, що відноситься до думки, що різко збільшити вплив бомбардування курсу між близько 3. 92 і 3. 85 мільярдів років тому постраждалі внутрішній сонячної системи – зокрема, зареєстровані в численних кратерів і великих басейнів на місяць.
Industry:Astronomy
Shallow depression, resembling a thumb print in clay, that is commonly seen on meteorites. Regmaglypts are formed by ablation from the surface by vortices of hot gas as a meteor falls through a planetary atmosphere.
Industry:Astronomy
An element with atomic number 8; symbol: O. It is actually the most common element in the crusts and mantles of the inner planets and rocky moons, making up all silicate minerals. Along with hydrogen, carbon, and nitrogen, oxygen is essential to life.
Industry:Astronomy
The random movement (spreading) of molecules from regions of highest concentrations to regions of lowest concentrations.
Industry:Astronomy
The spontaneous breaking apart, or decay, of unstable nuclei in isotopes. The unstable radioactive isotope is called the parent, and the products of the decay of the parent are called the daughter isotopes.
Industry:Astronomy
The amount of time required for half of the mass of a radioactive isotope to decay.
Industry:Astronomy
Angle along the orbit of a planet or other Solar System object as measured from the ascending node (analogous to right ascension and longitude).
Industry:Astronomy
A stony-iron meteorite that is a mixture of isolated silicate crystals (usually olivine) surrounded by metal.
Industry:Astronomy
