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A "light year" is the distance in which a particle of light will travel [in a year], ... Whats a light year? What is light ears? What is metric light year? When we'll have light year? What is a light-year calledd? How many kilometers in a year? What and how far is a light year? How many kilometers are in 3 light year?
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wiki.answers.com/Q/What_is_a_light_year
wiki.answers.com/Q/What_is_a_light_year
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1 year ago ... How far? nearly 3 000 000 km (2 997 924...km); How fast? At the speed of light: 299,792,458 m/s ... 299 792 458 miles is how fast light travels in a second. so light travels at; 29,979.2 miles per millisecond...
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answers.yahoo.com/question/index?qid=20081009175828AA9E...
answers.yahoo.com/question/index?qid=20081009175828AA9EM1k
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Astronomer use the speed of light to measure how far away things are in space. They use a unit called the light-year. A light-year (ly) is the distance that light can travel in one year. In one year light travels about 5,880,000,000,000 miles or 9,460,000,000,000 kilometers.
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coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/def_lig...
coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/def_lightyear.shtml
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How far does light travel in one second ? 300 000 kilometers, which equals seven times around the Earth.; Let's call this distance one light second. We can use this as a ruler to measure distances in space. Beyond the Sun and its planets we need a longer ruler, which is the distance light travels in one year.
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www.hartrao.ac.za/other/howfar/howfar.html
www.hartrao.ac.za/other/howfar/howfar.html
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In our every day lives light seems to travel from one place to another instantaneously. When we flip on the light in a room there is no delay between when we first see the bulb ... The distance light can travel in a year is called a "light year." The light year is one of the basic measures of distance for astronomy.
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unmuseum.mus.pa.us/speed.htm
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The reason I ask is, ordinarily, people will say that after one year, light will be one light year from its starting point. How long does it take a photon to travel one Planck length? One Planck second, obviously, right? ... This question about "How far does light t… " was originally asked on Yahoo! Answers United States...
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sg.answers.yahoo.com/question/index?qid=20080204235730A...
sg.answers.yahoo.com/question/index?qid=20080204235730AA2wbnl
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Even though Galileo tried to measure it in the 16th century, the closest measurement obtained in the continent of Europe was that of Ole Romer, a physicist from Denmark, in the year 1676. However the very first triumphant attempt to properly record the speed of light was made ... How Far Does Light Travel In 1 Second?
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www.blurtit.com/q505323.html
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A light nanosecond -- the distance light can travel in a billionth of a second -- is about 1 foot (about 30 cm). Radar uses this fact to measure how far away something like an airplane is. A radar antenna sends out a short radio pulse and then waits for ... A light year is the distance that light can travel in a year, or:
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www.howstuffworks.com/question94.htm
www.howstuffworks.com/question94.htm
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A light year is simply the distance light can travel in one year. Since light can travel 300,000 km (186,000 miles) in one second, can you imagine how far it can travel in one year?
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library.thinkquest.org/TQ0312074/ly.htm
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