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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


Hint: A light-year is a unit of distance, not time. ... Even in light years, measuring distances across the universe becomes unwieldy. But measuring in something ...

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.

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 ...

How Long is a Light Year? - Universe Today


Sep 10, 2009 ... 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 ...

Distance Measure - 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 ...

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 ... to the sun (93 million miles) as the standard for one astronomical unit (1 AU).

How do the scientists measure the distance in light years? - Quora


... in light years. Rather, they measure them in a unit called the http://... ... How come Unit of distance "LIGHT YEAR" got its name from unit of time? How are ...

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How far is a light-year? | Astronomy Essentials | EarthSky


Nov 27, 2015 ... He did this by relating the light-year to the astronomical unit – the Earth-sun ... measure the distance to the Andromeda galaxy using light-years.

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.

How Far Is A Light Year? - Universe Today


As the phrase “light year” implies, that's the distance that light travels in a year. It's as ... usually use another unit called the parsec (which is about 3.26 light years). ... that makes more physical sense with respect to how we measure distances.