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Light-year - Wikipedia
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 (Scientific notation: 9.4607304725808 × 10 km), which is approximately 5.88 trillion mi. As defined by the International Astronomical Union (IAU), a light … 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 the 365.2425-day Gregorian year or the 365.24219-day Tropical year that both approximate) … 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. … See more
• The dictionary definition of light-year at Wiktionary See more
1838Friedrich Bessel successfully measured the distance to a star other than the Sun, by using a 160-millimetre (6.2 in) heliometre designed by Joseph von Fraunhofer.1851The light-year unit appeared in a German popular astronomical article by Otto Ule.1984The International Astronomical Union (IAU) defined the light-year as the distance that light travels in a vacuum in one Julian year (365.25 days).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 from a few thousand to a few hundred thousand light-years in diameter, and are … See more
• 1 petametre (examples of distances on the order of one light-year)
• Einstein protocol
• Hubble length See moreWikipedia text under CC-BY-SA license Convert Light Years to Kilometers - CalculateMe.com
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What Is a Light-Year? - NASA Space Place
WEBJul 9, 2024 · A light-year is the distance light travels in one Earth year, about 9 trillion km. Learn how we use light-years to measure the distance of objects in space and how they relate to time and history.
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