|
|
|
|
|
|
The 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 onesecond, and is equal to exactly 299792458 metres (just over 186282 miles).
Dekameter or decameter is a common metric unit of distance. It is equal to 10 meters or 32.8084 feet. Plural name is dekameters.