en

light year

1

Terminological databases

Kosmoseteaduse ja -tehnoloogia terminibaas

ID 576101 Last modified 11.12.2025
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Domain astronomy
light-year
  • pikkusühik, mis on võrdne vahemaaga, mille valguskiir läbib ühe aasta jooksul
  • unit of length used to express astronomical distances, equal to the distance that light travels in vacuum in one Julian year (365.25 days)
    Good to know
    • The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in nonspecialist and popular science publications. The unit usually used in professional astrometry is the parsec [ IATE:1412953 ]. https://en.wikipedia.org/wiki/Light-year
Related
valgusaasta
Usage examples
  • Valgus jõuab lähimast tähest Maani 4,2 aastaga. Täht on järelikult 4,2 valgusaasta kaugusel.
light-year
Usage examples
  • Alternatively the light-year (ly) is sometimes used in scientific papers as a distance unit, although its use is mostly confined to popular publications and similar media. The light-year is roughly equivalent to 0.3 parsecs, and is equal to the distance traveled by light in one Julian year in a vacuum, according to the IAU.
light year
Usage examples
  • A light year is a unit used to measure distance, not time. One light year is the distance travelled by light in one year.

Metroloogia terminibaas

ID 572106 Last modified 05.09.2024
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Domain metrologyunits of measurement
  • pikkuse SI ühikutest sõltumatult määratletud pikkusühiku, mis võrdub vahemaaga, mille valguskiir läbib ühe aasta jooksul, nimetus
  • name of the unit of off-system units for length
valgusaasta
Usage examples
  • Maast vaid 11 valgusaasta kaugusel asuva tähe Ross 128 ümber tiirleb Euroopa Lõunaobservatooriumi astronoomide sõnul Maa-suurune planeet, mille pinnalt võiks leida vedelas olekus vett.
light year

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