The term MILKY WAY UNIT is composed of two words, BAR and STAR. A BAR is a unit of measurement equal to 10 million solar masses, while a STAR is a celestial body that produces its own light and heat. The Milky Way is the galaxy in which our Solar System is located, and it is composed of billions of stars and other objects. Therefore, the term MILKY WAY UNIT refers to a unit of measurement used to measure the mass of stars and other objects in the Milky Way.