... M13: The Great Globular Cluster in Hercules . ... M13 is one of the most prominent and best known globular clusters. Visible with binoculars in the constellation of Hercules, M13 is frequently one of the first steps beyond the ordinary visible to the casual sky gazer. ... It shines with the brightness of 100 billion Suns. ... Comet Hyakutake and the Milky Way . ... Two years ago, the Great Comet of 1996, Comet Hyakutake, inched across our northern sky during its long orbit around the Sun. ...