A light year
Stellar distances are measured in light-years, which is the average distance between the Earth and the Sun.
-- The distance that light travels in some amount of time is expressed in units of distance. -- The time that it takes light to cover some amount of distance is expressed in units of time. -- The speed of light is expressed in units of speed . . . distance/time
Here are some international units of measurement:Mass is expressed in kilograms.Length and distance is expressed in meters.Time is expressed in seconds.Electrical current is expressed in amperes.Speed is expressed in meters/second.
Wavelength (Apex)
Distance is typically expressed in meters (m) in the International System of Units (SI).
Mass is not expressed in kilometers (km). That is a measure of distance. Mass is expressed in units of kilograms (kg)
A measure of length or distance expressed in Imperial units.
The unit will depend on the context of the direction. For distance on land the units should be meters.
Assuming you mean "phase", it is usually expressed in angular units - degrees, or radians.
speed =distance/time and units of speed can differ depending on the circumstance. in science we usually measure speed as meters per second (m/s) can also be written ms^-1.
Astronomical Units, parsecs, light years, take your pick.
Directions are expressed as units of