Light-Year
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A light-year or light year is a unit of length, equal to just under 10 trillion kilometres. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. The light-year is often used to measure distances to stars and other distances on a galactic scale, especially in non- specialist and popular science publications. The preferred unit in astrometry is the parsec, because it can be more easily derived from, and compared with, observational data. The parsec is defined as the distance at which an object will appear to move one arcsecond of parallax when the observer moves one astronomical unit perpendicular to the line of sight to the observer, and is equal to approximately 3.26 light-years
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GarantieWeitere Informationen
- Allgemeine Informationen
- GTIN 09786130651985
- Editor Frederic P. Miller, Agnes F. Vandome, John McBrewster
- Sprache Englisch
- Genre Physik & Astronomie
- Größe H220mm x B150mm x T8mm
- Jahr 2010
- EAN 9786130651985
- Format Fachbuch
- ISBN 978-613-0-65198-5
- Titel Light-Year
- Untertitel Units of measurement, Length, Orders of magnitude (numbers), Kilometre, International Astronomical Union, Speed of light, Vacuum, Julian year (astronomy), Galaxy, Popular science, Astrometry
- Gewicht 209g
- Herausgeber Alphascript Publishing
- Anzahl Seiten 128
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