Last Updated
：2025/11/19
light year
IPA(Pronunciation)
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。
Sense（1）
（ plural ）
Quizzes for review
(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
The nebula lies roughly one light year across, revealing its immense scale to astronomers.
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The nebula lies roughly one light year across, revealing its immense scale to astronomers.
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