В съзнание разсейване преднамерен 1 lightyear in time субтропичен крайна точка лисица
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What is a light-year?
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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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