- Industry: Astronomy
- Number of terms: 6727
- Number of blossaries: 0
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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 growth of planets from smaller objects by impact, one impact at a time. After formation, planets are said to have "accreted" from small objects.
Industry:Astronomy
A deviation from the common rule, type, or form; something abnormal or inconsistent.
Industry:Astronomy
Adjective used to describe a breccia that has an assortment of fragments of many different rock compositions and textures. (See also monomict. )
Industry:Astronomy
The material between the stars, consisting of gas, dust and cosmic rays (high energy charged particles, moving at nearly the speed of light).
Industry:Astronomy
An iron-oxide mineral (Fe<sub>2</sub>O<sub>3</sub>) that may be the cause of the red color on Mars. Courser-grained gray hematite has the same chemical formula as the red variety, but a different crystalline structure. The deposits of gray hematite found in the Terra Meridiani region of Mars may suggest that water once circulated through the region's rock layers.
Industry:Astronomy
The initial crater excavated in the target rock during the first stage of an impact-cratering event.
Industry:Astronomy
A sensor for measuring temperature. It consists of two dissimilar metals, joined together at one end, which produce a small voltage proportional to the temperature.
Industry:Astronomy
Study of the origin, distribution, and destiny of life in the universe. These are interdisciplinary studies involving astronomers, astrophysicists, biologists, chemists, geneticists, geologists, paleontologists, planetary scientists, and specialists from other scientific fields. Three broad themes of astrobiology: Is there life elsewhere in the universe? How did life begin and evolve? What is the future for life on Earth and beyond?
Industry:Astronomy
