The reason scientists use light years instead of kilometres is becasue a light year is the distance traveled by light in one year, and if we actually did the math (ill just give it to you)
to put that into perspective a kilometer is 1000 meters or 
. if they mesured everything in kilometers they would have to use even bigger numbers than they already do.
This is PLZ HELP MY MOM GONNA GROUND ME!!!! Which step is part of a scientific investigation?
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