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Cosmic Pandemonium: What is a Light Year?
/img/iea/bjOLknylwe/what-is-lightyear.jpg "Light year: What is a light year and How long is a light year")
Light year: What is a light year and How long is a light year
Light Year Visible light travels at a speed of 186,000 miles/second, or to think of this speed in terms of time and distance, a light- second is 186, ppt download
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What is a light-year?
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