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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.

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) .

1 light year is equal to how many years of the Earth? - Quora


May 10, 2015 ... Light year to Earth's orbit ratio. The light year is used to measure astronomical .... It sounds confusing for a layman but "light year" not a unit of time. Hence, it makes no sense to compare it to a year on earth. It is a unit of ...

Light-Year - Cool Cosmos


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

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 ...

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 ...

Why is a light-year a unit of distance rather than a unit ... - NSTA News


Sep 26, 2006 ... First, the light-year. It's easy to see why people think it must be a measurement of time because after all, the word year is in it. And of course ...

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?

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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.

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.

How Long is a Light Year? - Universe Today


May 18, 2016 ... A light year is the distance light can travel in vacuum in one year's time. ... For comparison, consider the circumference of the Earth when measured at the equator: ... Because of its great scale, the light year is one of the units of ...