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


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.


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 ...


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 ...


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 ...


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) .


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.


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


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