English Dictionary

light year

IPA（発音記号）

/ˈlaɪt.jɪə/

名詞

比喩的用法 くだけた表現 複数形

(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.

日本語の意味

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。

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

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。

意味（1）

(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.

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.

意味（2）

(only in plural, figuratively, informal) A very long way.

The marathon runner in the lead is light years ahead of the one at the back.

意味（3）

(only in plural, figuratively, informal) A very long time.

Some of Leonardo da Vinci’s inventions were light years ahead of their time.

light years （ plural ）