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  1. Light-year - Wikipedia

    • A light-year, alternatively spelled light year (ly or lyr ), 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-year is the distance that light travels in a vacuum in o… See more

    Definitions

    As defined by the International Astronomical Union (IAU), the light-year is the product of the Julian year (365.25 … See more

    History

    The light-year unit appeared a few years after the first successful measurement of the distance to a star other than the Sun, by Friedrich Bessel in 1838. The star was 61 Cygni, and he used a 160-millimetre (6.2 in) heliometre designed … See more

    Usage of term

    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 hundre… See more

    Related units

    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 similarly be formed usefully by multiplying … See more

     
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  2. Approximately 5.88 trillion mi

    A light-year, alternatively spelled light year (ly or lyr), 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 12 km), which is approximately 5.88 trillion mi.
    en.wikipedia.org/wiki/Light-year
    en.wikipedia.org/wiki/Light-year
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  4. How far is a light-year? Plus, distances in space

    WEBApr 27, 2023 · Learn how to measure the vast distances in space using light-years, miles and kilometers. See examples of how far away stars, galaxies and other objects are from Earth.

     
  5. What Is a Light-Year? | NASA Space Place – NASA …

    WEBSep 27, 2024 · A light-year is the distance light travels in one Earth year, about 6 trillion miles. Learn how we use light-years to measure the distance of objects in space and how they relate to time and space.

  6. What is a light-year? - NASA Science

  7. How Far is a Light Year? | The Fastest Thing in the …

    WEBLearn what a light-year is, how astronomers use it to measure vast distances in space, and how light shows us the past. Find out how far the Moon, the Sun, the planets, the stars, and the galaxies are from Earth in

  8. What is a light-year? | Space

    WEBDec 22, 2021 · A light-year is the distance light travels in a year, which is about 6 trillion miles (9.7 trillion kilometers). Learn how astronomers use light-years and other units to measure cosmic distances and time.

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

  10. Cosmic Distances - Science@NASA

  11. What Is a Light Year? Definition and Examples

    WEBMay 28, 2020 · A light year is the distance light travels in one Earth year, about 9.46 trillion kilometers or 5.88 trillion miles. Learn how to use light years to measure distances to stars and galaxies, and how they differ …

  12. Light-year: All you need to know - Space & Telescope

    WEBDec 25, 2023 · A light-year is the distance light travels in one year in space, and it is equal to 365*24*60*60*300,000 kilometers or 9.46 trillion kilometers or 5.88 trillion miles.

  13. How Far is a Light Year? - Universe Today

    WEBNov 13, 2009 · A light year is the distance that light travels in a single year, which is about 9.5 trillion kilometers. Learn more about light years, parsec, speed of light and other tools for measuring distance in the Universe.

  14. Light Year Calculator

  15. What Is a Light-year? - HowStuffWorks

  16. What is a light-year? - Cool Cosmos

  17. What is a light year? Find out. | Sky Archive | EarthSky

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

  19. What is a light-year and how is it used?? - NASA

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

  21. What Is a Light-Year? - Live Science

  22. How Many Years in a Light Year? Time vs. Distance

  23. What Is A Light Year? - WorldAtlas

  24. Light years guide for KS3 physics students - BBC Bitesize

  25. Convert Light Years - CalculateMe.com