what is light year how can you define it what is the astronomical unit
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One light year is almost six trillion miles. And an astronomical unit is the average distance between the earth and the sun. So the distance to the sun is by definition one AU. A parsec is the distance at which one astronomical unit subtends an angle of one second of arc.Mar 16, 2015
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The distance traveled by a beam of photons in a period of 31536000 seconds is known as 1 light year.
One light year is 63241.077 Astronomical units!
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