- 업종: Aerospace
- Number of terms: 16933
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The Executive Branch agency of the United States government, responsible for the nation's civilian space program and aeronautics and aerospace research.
Also known as the "Geminids," the Geminid Meteor Shower is an annual meteor shower that occurs around December 13th-14th of each year. Unlike other meteor showers, which originate from the debris of passing comets, the Geminids are the visual debris stream of an object called 3200 Phaethon, which is presumed to be an asteroid in the Pallas family.
To date, NASA can not figure out why the Geminid Meteor Shower is as bright as it is, and thus the Geminids are a unique yearly occurrence in the world of astronomy.
Industry:Astronomy
The invisible electromagnetic radiation beyond the violet end of the spectrum of visible light, of wavelengths ranging, roughly, from 4000 down to 400 angstroms.
Industry:Astronomy
The position on the celestial sphere occupied by the sun on or about march 21 when its path on the ecliptic crosses the celestial equator going from south to north. This point is also called the march equinox and the first point of aries.
Industry:Astronomy
The position on the ecliptic occupied by the sun about december 22 when it reaches its greatest southerly declination.
Industry:Astronomy
Very short wavelength radiations beyond the ultraviolet in the spectrum, which are about one ten-thousandth as long as the visible violet and are extremely penetrating.
Industry:Astronomy
