What is the unit of measurement of distance of stars form the earth?

There are several popular units of measurements to measure these large distances.

One is the light year, which is the distance light can travel in one year (it travels 300,000 m/s). A light year is equal to a little less than 10^16 meters.

Another unit of measurement is the parsec, or "parallax second" which is defined by the distance of an object that shifts one arcsecond in the sky per user movement of 1 A.U. (astronomical unit) It is equal to 3.26 light years or about 3x10^16.

A final unit of measurement that is widely used in the solar system, such as from Earth to our star, the Sun, is the astronomical unit which is the distance from the Earth to the sun. One A.U. is approximately 1.5 x 10^8 km.