Scientists measure light from star in light years because almost every other units would be so small compared to the distance involved between stars. in fact the nearest star (other then the sun) is 24689699219682.054 miles or 39734219301000 km.
To measure the distance of stars you have to measure by light years.
They measure them in light-years.
light years
light years
light years
Light years or parsecs
light years
Light years are used to measure distance from Earth to distant stars and planets.
usually the space is measured in light years
you use light years, and other units
Light Years.
Usually light-years, or parsecs.