Last Updated：2025/11/19

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(astronomy) A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (10¹⁶ metres)) equal to the distance light travels in one Julian year; used to measure extremely large distances.

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light year

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Source Word

light year

IPA(Pronunciation)

/ˈlaɪt.jɪə/

Noun

figuratively informal plural

Japanese Meaning

光年：天文学における距離の単位で、光が1ジュリアン年（約365.25日）に進む距離を表す。約10¹⁶メートル、または10兆キロメートルに近い値とされ、極めて大きな距離を測る際に使用される。

What is this buttons?

The nebula lies roughly one light year across, revealing its immense scale to astronomers.

Google Translation / DeepL Translation

その星雲はおよそ1光年の幅があり、天文学者たちにその巨大さを示している。

Details

Sense（1）

We live our lives in three dimensions for our threescore and ten allotted years. Yet every branch of contemporary science, from statistics to cosmology, alludes to processes that operate on scales outside of human experience: the millisecond and the nanometer, the eon and the light-year.

Google Translation / DeepL Translation