light second

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Related to Light-second: light minute, light hour, Light-day

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Noun

light second - the distance light travels in a vacuum in one second; approximately 300,000 kilometers

astronomy unit - a linear unit used for astronomical distances

light year, light-year - the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

References in periodicals archive ?

If we could have been around when the cosmos was 1 second old, we would have seen only objects less than 1 light-second away, not as far as the moon now is.

True ZITs: can such things be?

It's at a distance of 8.8 light-minutes compared to the Moon's distance of 1.3 light-seconds.