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- A light-year is a unit of length used to express astronomical distances1. It is equivalent to about 9.46 trillion kilometers or 5.88 trillion miles1. A light-year is defined by the International Astronomical Union (IAU) as the distance that light travels in a vacuum in one Julian year (365.25 days)1. Alternatively, a light-year is the distance that light travels through a vacuum in one year2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.A light-year, alternatively spelled light year, is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (9.46 × 1012 km), or 5.88 trillion miles (5.88 × 1012 mi). [note 1] As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days).en.wikipedia.org/wiki/Light-yearA light-year is the distance that light travels through a vacuum in one year.en.wikipedia.org/wiki/Light_year_(disambiguation)
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A light-year, alternatively spelled light year (ly), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km, which is approximately 5.88 trillion mi. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in … See more
As defined by the International Astronomical Union (IAU), the light-year is the product of the Julian year (365.25 days, as opposed to … See more
The light-year unit appeared a few years after the first successful measurement of the distance to a star other than the Sun, by See more
Distances between objects within a star system tend to be small fractions of a light-year, and are usually expressed in astronomical units. However, smaller units of length can … See more
• The dictionary definition of light-year at Wiktionary See more
1838Friedrich Bessel made the first successful measurement of the distance to a star other than the Sun, 61 Cygni, using a heliometer.1851Otto Ule introduced the light-year unit in a German popular astronomical article.1868An English journal labelled the light-year as a unit used by the Germans.1968 to 1983The IAU (1964) System of Astronomical Constants, based on the tropical year and a measured speed of light, was used for expressing the light-year.1984The IAU (1976) System of Astronomical Constants, based on the Julian year and the defined speed of light, was adopted and is still in use today.Distances expressed in light-years include those between stars in the same general area, such as those belonging to the same spiral arm or globular cluster. Galaxies themselves span … See more
• 1 petametre (examples of distances on the order of one light-year)
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• See moreWikipedia text under CC-BY-SA license WEBFeb 20, 2013 · A light-year is the distance light travels in one year, about 6 trillion miles. Learn how astronomers use light-years to measure cosmic distances and how light speed affects our view of the universe.
WEBDec 22, 2021 · A light-year is a measure of astronomical distance: Light travels through a vacuum at precisely 983,571,056 feet (299,792,458 meters) per second, making a light-year approximately 6...
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