A light-year, alternatively spelled light year (ly), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580...

Look up light year in Wiktionary, the free dictionary. A light-year is the distance that light travels through a vacuum in one year. Light year(s) and...

Year of No Light is a French post-metal band formed in Bordeaux in 2001. On their 2006 debut album Nord, the band combined a dark and aggressive sludge...

The International Year of Light and Light-based Technologies 2015 or International Year of Light 2015 (IYL 2015) was a United Nations observance that aimed...

foot) to the light-minute, light-hour and light-day, which are sometimes used in popular science publications. The more commonly used light-year is also currently...

unintuitive. By convention, the Julian year is used in the computation of the distance covered by a light-year. In the Unified Code for Units of Measure...

ranger sent to stop the Evil Emperor Zurg. He further believes that his red light bulb "laser" is a deadly weapon, his wings are functional aircraft-grade...

The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately...

are only about half a light-year across and weigh in at about two solar masses their size varies: a globule one quarter light year in radius has 5.5×1046 m3...

"The Hundred Light-Year Diary" is a science-fiction short story by Australian writer Greg Egan, first published in Interzone 55 in January 1992. It was...