millimeters, centimeters, meters, kilometers, miles, yards, feet, inches,...
metre
There area many units used for measurement of the distances .But , the S.I unit od distance is meters ( m ) .
Fathoms I think.
light years
Lightyears and miles
Meters and Kilometers
It depends on what it of distance is being used. A million million kilometres is 6684 astronomical units, which is the distance travelled by light in 3.3 million seconds, or 5½ weeks.
SI distance units are the meter (m) for length, the kilometer (km) for longer distances, and the centimeter (cm) and millimeter (mm) for smaller distances. These units are widely used in scientific and everyday measurements.
Light year or astronomical units
For measuring length/distance, meter is used. Other units are km / cm/ mm.
In olden days, they were used for measuring mass, distance and volumes. Nowadays, these units are not used in science anywhere in the world except in the US.
Miles and Kilometers? Centimeters and Inches? Meters and Feet?