Over in the southwest this evening there is a concentration of globular star clusters. No, you can’t see them with the unaided eye, but with a telescope you could find them – and each cluster you see contains thousands and thousands of stars packed in tight by gravity. Globular star clusters are all around us, but about half of them are gathered into one small spot in the sky, near the constellation Sagittarius. An astronomer named Harlow Shapley, born on November 2nd, in 1885, realized the significance of this clustering of clusters. In 1920 he suggested that because the globular clusters seemed to be centered around Sagittarius, that it was probable that that marked the center of the Milky Way galaxy. He was right – our solar system is part of the Milky Way, but we’re not in the middle of it, we’re a little over halfway out toward its edge.