- Settore: 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 immense cloud of gas and particles of floating cosmic dust from which our Solar System (Sun and planets) condensed 4. 6 billion years ago.
Industry:Astronomy
The angular distance North or South from the Earth's equator measured in degrees on the meridian of a point; Equator being 0° and the poles 90° N and 90° S.
Industry:Astronomy
The buildup of heavy isotopes inside massive stars by the rapid (hence the use of "r") absorption of neutrons by atomic nuclei. See also s-process and supernova.
Industry:Astronomy
Angle between the plane of the object's orbit and the ecliptic (defined by Earth's orbit).
Industry:Astronomy
The time when the Sun is 6-12 degrees below the horizon. Sky begins to get noticeably bright.
Industry:Astronomy
La scorza vetrosa, fusa su un meteorite che si forma quando la roccia si passa attraverso l'atmosfera terrestre.
Industry:Astronomy
Colpa del basso angolo in cui roccia sopra l'aereo del difetto si sposta fino in relazione alla roccia sottostante.
Industry:Astronomy
Single-celled microorganisms whose cells lack a nucleus. Bacteria comprise a major domain of life called prokaryotes. In contrast, the cells in eukaryotes have a well-defined nucleus; eukarya include molds, plants, and animals. Another major domain is called archaea, microorganisms with genetic features distinct from prokarya and eukarya. Most methane-producing bacteria are actually archaea, but for simplicity many biologists informally refer to all non-eukaryotes as "bacteria. "
Industry:Astronomy
