What is a light year??????????

A light-year is a distance.

It's the distance that light travels through vacuum in one year.

The distance is 9.4607 x 10¹² kilometers in metric units, and 5.8786 x 10¹² miles
in 'customary' units, and is normally written without a bunch of question marks.

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A light year is an unit of distance.

$

light year$ ≈ $10^1^3km$

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