by Belinda h. December 07, 2003


by Denozzo September 28, 2008

by Philip Stephenson November 30, 2004

by Hareeln August 12, 2012

The length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second
The meter has a cool definition!
by America Lover 🇺🇸 November 17, 2018
