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A light-year is a unit of length used informally to express astronomical .... is also used occasionally for approximate measures.

What is a light year? | Space | EarthSky


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 ...

What Is Light Year And Why Is It Used? | Starlab


Aug 1, 2013 ... Light year is used to measure the distance in space. ... using normal units of miles and kilometres, astronomers use light year to interpret it.

measurement - How light years is measured? - Physics Stack ...


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.

What is a light year? | HowStuffWorks


A light year is a way of measuring distance. That doesn't make much sense because "light year" contains the word "year," which is normally a unit of time.

Why do astronomers use light years to measure distances in space ...


One light year is a distance measurement equivalent to six trillion miles. ... measure some astronomical distances in light-years and some in astronomical units?

Light Years - Cool Cosmos


Astronomical units are usually used to measure distances within our solar system . ... 1 Astronomical Unit (A.U.) is the average distance between the Sun and the Earth. ... 1 light-year (ly) is the distance that light travels in one year in a vacuum.

What is a length unit "light year" (ly) - Conversions and Calculations


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

What is a lightyear? Is it a unit of time or distance? - Quora


A Light-year is a unit of distance. ... is the fundamental "yardstick" for measuring distance: all distance is ultimately measured in terms the speed of light and time.

Light-year - Science Daily


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 ...

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What is a light-year and how is it used?? - StarChild - NASA


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.

Units in Astronomy


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) .

Light-year - Units of Measurement Wiki - Wikia


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 ...