Last Updated：2025/11/26

(astronomy, physics) A unit of length equal to the distance light travels in one second: approximately 300,000 kilometers

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light second

Source Word

light second

(astronomy, physics) A unit of length equal to the distance light travels in one second: approximately 300,000 kilometers

Japanese Meaning

1秒間に光が進む距離を表す単位で、約30万キロメートルに相当する。

The observatory measured the comet's tail extending nearly one light second across, an astonishing size for a passing object.

天文台は彗星の尾がほぼ1光秒にわたって伸びていると測定し、通過する天体としては驚くほどの大きさだった。

Sense（1）

(astronomy, physics) A unit of length equal to the distance light travels in one second: approximately 300,000 kilometers

light seconds

（ plural ）