Light year (LY)
Light year (ly) is a unit of lenght used to measure astronomical distances, which is about 9.46 trillion kilometers ( 5.88 miles ) and this was defined by the IAU ( International Astronomical Union ).
One light year is the difference which light travels in a julian year(365.28 day).
Astronomers mostly use light year to measure the the universe.
One light year is the difference which light travels in a julian year(365.28 day).
Astronomers mostly use light year to measure the the universe.
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