A light year is a value of measurement. It's how far light can travel in a year. One light year is approx. 9,500,000,000,000 kilometers (nine trillion five hundred billion km)
========================
Definition: 1 LY = 9.4605284 x 1015 meters
kilometer, AU (astronomical unit), light year, parsec.
A light Year is longer. a light year is the distance light travels in one year. it is often used do describe the distance of objects in space because they are very far away and light travels very fast so a light year is very far.
A "Light year" is a distance. It's the distance light travels in one year, in vacuum.5,878,450,000,000 miles (rounded)9,460,450,000,000 kilometers (rounded)
The distance light travels in one year is called a light-year. To get the number 9,470,000,000,000, the unit used is the kilometer.
a light year, a mile, one astronomical unit
1 light-year = 9,460,528,400,000 kilometers (rounded)1 kilometer = 0.000000000000105702 light-year (rounded)262 kilometers = 0.000000000027694 light-year (rounded)
See the Question "http://wiki.answers.com/An_astronmoical_unit_is_a_larger_distance_unit_than_a_light_yearQuote "One light year is about 63,200 AU. An astronomical unit is about 8 light-minutes."
About 9.5 x 1012. That is 9.5 million million.
A light year is the distance light travels in a year - about 9.5 x 1012 km.
What is the approximate speed of light in kilometer per second?"
"Light-year" is not a speed, it is a distance - the distance light travels in a year.The speed of light is 300,000 kilometers per second. If you multiply that by 3600 (seconds/hour), you get the speed in km/hour.
The information about a light-year is not relevant to answer this particular question. To find out how far light goes (in a vacuum) in any specific time, simply multiply 300,000 (km/second) by the number of seconds.