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  2. In one Earth year of 364.25 days (8,766 hours), light travels a distance of 5,878,625,370,000 miles (9.5 trillion km). This distance is referred to as one light year.
    interestingengineering.com/science/lightyears-101-…
    A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles (9.7 trillion kilometers).
    www.space.com/light-year.html
    Generally speaking, there are 63,000 astronomical units in one light-year, and 63,360 inches (160,000 cm) in one mile (1.6 km). This wonderful coincidence enables us to bring the light-year down to Earth. So, if we scale the astronomical unit – the Earth-sun distance – at one inch, then the light-year on this scale represents one mile (1.6 km).
    earthsky.org/astronomy-essentials/how-far-is-a-ligh…
     
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    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 … 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 Friedrich Bessel in 1838. The star was 61 Cygni, … See more

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

    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

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

    WEBSep 17, 2024 · For most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 …

  6. 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 astronomers …

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

  8. What is a light-year? | Space

  9. What Is a Light Year? Definition and Examples

    WEBMay 28, 2020 · A light year (ly) is the distance light travels in one Earth year. It is 9.4607×10 15 meters or 5.8786×10 12 miles, about 63 astronomical units or about 0.3 parsecs. It is an intermediate unit of …

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

    WEBFeb 20, 2013 · Astronomers measure the distance to the Andromeda galaxy using light-years. One light-year equals about 6 trillion miles. This galaxy is over 2 million light-years from Earth.

  11. Cosmic Distances - NASA Science

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

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

    WEBNov 13, 2009 · A light year is 5,878,625,373,183.6 miles. And a light year is 63,241 astronomical units (1 astronomical unit, or AU is the average distance from the Earth to the Sun). But a light year isn’t...

  14. Scientists Say: Light-year - Science News Explores

    WEBMar 16, 2020 · One light-year is about 9.48 trillion kilometers (5.88 trillion miles). That’s a huge distance. In our solar system, Neptune is the farthest planet from the sun at about 4.5 billion kilometers (2.8 billion miles) from …

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

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

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

  20. What is a light-year? - NBC News

  21. What is a light year? Why you might not be seeing stars in real time.

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