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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. However, smaller units of length can … 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 … See more

    1 petametre (examples of distances on the order of one light-year)
    Einstein protocol
    Hubble length See more

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

    WEBLight is the fastest thing in our Universe traveling through interstellar space at 186,000 miles/second (300,000 km/sec). In one year, light can travel 5.88 trillion miles (9.46 trillion km). A light year is a basic unit …

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

  5. What Is a Light Year? Definition and Examples

    WEBMay 28, 2020 · The light year (ly) is a unit of length that is the distance light travels in a vacuum in one Earth year. One light year is …

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