- 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 ...
Mixture of gases that surround and are gravitationally attached to a planet.
Industry:Astronomy
Fluid magma that flows onto the surface of a planet or moon; erupted from a volcano or fissure. Also, the rock formed by solidification of this material.
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 relationship of a distance on a map or model to the true distance in space; written as a ratio, such as 1:24,000.
Industry:Astronomy
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.
Industry:Astronomy
A constant value: 299,792,458 meters per second (186,282 miles per second).
Industry:Astronomy
