Light-second - Hutchinson encyclopedia article about Light-second Printer Friendly
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light second
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light second

Unit of length, equal to the distance travelled by a beam of light in a vacuum in one second. It is equal to 2.99792458 × 108 m/9.83571056 × 108 ft. See light year.



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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? by Thomsen, Dietrick E. / Science News
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