Question. What is lightyear?


Answer. A lightyear is actually a measure of distance. It is the length a light beam will travel in a single year.
Light is pretty stinking fast clocking in at more than one billion miles per hour! In one year a light beam
will cover more than a trillion miles!
 

Below is an image of the entire Earth which is only a billionth of a light year across!  The entire solar system including all nine planets is less than 1/1000 of a lightyear