1. Light-secondA light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299,792,458 metres. It is just over 186,000 miles and almost 9.84×10 feet. Just as the second forms the basis for other units of time, the light-second can form the basis for other units of length, ranging from the light-nanosecond (just under one U.S.
Read “Light-second” on English Wikipedia
Read “光秒” on Japanese Wikipedia
Read “Light-second” on DBpedia
Read “Light-second” on English Wikipedia
Read “光秒” on Japanese Wikipedia
Read “Light-second” on DBpedia
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