Our Galaxy's Spiral Structure

​Morgan et al. (1953) provided evidence that our galaxy has a spiral shape; using stars of spectral type O and B as tracers to map the spiral structure of the Milky Way. Using the modern parallaxes for the same stars. We have compiled Gaia and Hipparcos data for the sample used by Morgan et al. to recreate Morgan’s study with better distances and produce a revised map of the Milky Way’s spiral structure. The data includes over 400 stars in 27 aggregates. With these data we will find their positions in 3 dimensions and create our 2D map of the Galaxy.