Last Updated
：2025/11/26
light second
（ plural ）
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(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
The observatory measured the comet's tail extending nearly one light second across, an astonishing size for a passing object.
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The observatory measured the comet's tail extending nearly one light second across, an astonishing size for a passing object.
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