Light is the fastest known thing
That is measurable

Space is so immense
Most things are farther away
Than what light can travel to
In a short period of time

Because of this
We use the fastest source
To reference there distance

Light years
Light minutes
Light seconds

How long light travels in time
We use this to measure distance
Because that’s how far out
Things are in space

Time is distance in light years

One second in light years
Is 186,000 miles
Or 7 times around Earth

The distance between
Earth and the Sun
Is 8 light minutes

A light year
Is about 6 trillion miles

It is a unit of length
Not time
But distance
Enormous distances