- 産業: 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 ...
Solid rock or mineral fragments transported and deposited by wind, water, gravity, or ice; precipitated by chemical reactions; or secreted by organisms; accumulated as layers in loose, unconsolidated form.
Industry:Astronomy
A unit of astronomical distance equal to 3. 26 light years, or 206265 AU, which equals 3. 08 x 10<sup>13</sup> kilometers.
Industry:Astronomy
The intensity of electromagnetic radiation (such as ultraviolet, visible light, and infrared, etc. ) across a range of wavelengths. A prism separates white light into the range of wavelengths we call a rainbow of colors. "Spectrum" is the singular form of the word.
Industry:Astronomy
The second in NASA's Discovery program of low-cost spacecraft with highly focused science goals, Mars Pathfinder landed successfully on Mars on July 4, 1997. Images, science results, and engineering data were released on the World Wide Web throughout, and beyond, the primary mission dates (July 4 - August 3, 1997. ) The Jet Propulsion Laboratory, Pasadena, CA, developed and managed the Mars Pathfinder mission for NASA's Office of Space Science, Washington, D. C. JPL is a division of the California Institute of Technology (Caltech).
Industry:Astronomy
The angular distance East or West, between the meridian of a particular place on Earth and that of Greenwich, England, expressed in degrees or time.
Industry:Astronomy
The measure of the degree of elongation of an ellipse. For example, a circle has an eccentricy of 0, and a parabola (an open figure) an eccentricity of 1. The deviation of an orbit from a perfect circle.
Industry:Astronomy
A gas molecule composed of one part nitrogen and three parts hydrogen; NH<sub>3</sub>.
Industry:Astronomy
A table of positions in right ascension (celestial coordinate corresponding to longitude on Earth) and declination (celestial coordinate corresponding to latitude on Earth), as a function of time for a moving celestial object.
Industry:Astronomy
The official scale (created by Professor Richard P. Binzel and formalized in Torino, Italy in 1999) for categorizing the Earth impact hazard for asteroids and comets. Values range from 0 (no chance of collision with Earth) to 10 (collision with global climatic disasters). (Torino Scale)
Industry:Astronomy
