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en.wikipedia.org/wiki/Light-year

... fractions of a light year, and are usually expressed in astronomical units. ... is also used occasionally for approximate measures.

starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second.

earthsky.org/space/what-is-a-light-year

Feb 20, 2013 ... Hint: A light-year is a unit of distance, not time. ... A light-year is how astronomers measure distance in space. It's defined by how far a beam of ...

www.sciencedaily.com/terms/light-year.htm

A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in a vacuum in one year. While there is no ...

units.wikia.com/wiki/Light-year

The original article was at Light-year. The list of authors can be seen in the page history. As with the Units of Measurement Wiki, the text of Wikipedia is available ...

www.telescope.org/nuffield_21_sci/astrounits.htm

How Distances are Measured in Astronomy. Dealing with ... AU (astronomical units) ... The light year is is the distance that light travel in one year (365 1/4 days) .

physics.stackexchange.com/questions/17968/how-light-years-is-measured

Dec 7, 2011 ... We don't directly measure distances to anything light years away by timing light. " Light year" is just a unit of distance like a mile or kilometer.

coolcosmos.ipac.caltech.edu/cosmic_classroom/cosmic_reference/distance.html

In astronomy, the most commonly used measures of distance are the light year, parsec and astronomical unit. Astronomical Unit (A.U.) An astronomical unit ...

www.aqua-calc.com/what-is/length/light-year

The light year (ly) definition and its relation to other length measurement units. Online unit conversions and unit conversion tables.