Transcript: The halo of the Milky Way galaxy is traced by the globular clusters and by individual stars that are dim and which contain a far lower metal abundance than the Sun or stars in the solar neighborhood. The distribution of globular clusters on the plane of the sky gives a clue both to the shape of the galaxy and to the Sun’s position within that distribution. For example, if we were at the center of a spherical cloud of globular clusters, we would count equal numbers in each direction in the sky, but if we were offset from the center, we would count more clusters in the direction towards the center. This simple technique was used by Harlow Shapley in the 1930s to show that the Milky Way was indeed spherical in the shape of its halo and that the Sun was not at the center of the distribution but was offset by eight or nine thousand parsecs from the center which was in the direction of the constellation Sagittarius.