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\section{Introduction}  A very important question in astronomy is if spiral galaxies are composed entirely of stellar material - stars. This question has puzzled astronomers for years and in this report, I will explain how to find the answer to this question. I will be finding the mass and luminosities luminosity  of 26 different galaxies in order to find the their  mass/luminosity ratio, ratio. I will be  using the Inital Mass Function to find the mass/luminosity ratio of stars, and comparing will compare  the two mass/luminosity  values. Once I have found both mass/luminosity rations, I will be able to find the percent of stellar mass in a galaxy. I will be using data from an astronomy Java program for the galaxy data and Guy Worthey's Interpolation Medel (an Initial Mass Function program) for the stellar data.