It's impossible to arrive at an exact measurement for the billions of stars and other objects that make up the Milky Way. However, a group of astronomers say they have calculated the most accurate estimate to date. In a paper that will be published in The Astrophysics Journal, the scientists estimate the mass of the Milky Way to be 9.5 x 1041 kilograms or 95 followed by 40 zeros. For reference, that's 4.8 x 1011 times the mass of the sun. Astronomers use the so-called "solar masses" as a standard unit of measure, comparing other objects and formations to the sun.