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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

    1838
    Friedrich 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.
    1851
    The light-year unit appeared in a German popular astronomical article by Otto Ule.
    1984
    The 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 more

     
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  4. Convert Light Years to Kilometers - CalculateMe.com

  5. Convert 1 Light Year to Kilometers - CalculateMe.com

  6. 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.

  7. Convert Light-years to Kilometers - MeteorConverter

  8. Lightyears to Kilometers (ly to km) - Metric Conversion

  9. 1 Light Years to Kilometers - UnitChefs

  10. Convert Light Year to Kilometer - Unit Converter

  11. Convert Light Years - CalculateMe.com

  12. Light Year Conversion - Omni Calculator

  13. Convert Light Years to Kilometers - Kyle's Converter

  14. Kilometers to Lightyears (km to ly) - Metric Conversion

  15. How far is a light-year? Plus, distances in space - EarthSky

  16. Light-year | Distance, Measurement, Time | Britannica

  17. What is a light-year? | Space

  18. Light Year Calculator

  19. What Is a Light Year? Definition and Examples - Science Notes …

  20. What is a light-year? - Science@NASA

  21. Value Of One Light Year - BYJU'S

  22. Convert Kilometers to Light Years - CalculateMe.com

  23. How to Calculate a Light Year: 10 Steps (with Pictures) - wikiHow

  24. How Long is a Light-Year? - NASA

  25. How Long Would It Take To Travel A Light Year - Explaining Space