Hubble Peers into the Most Crowded Place in the Milky Way May 29, 2015 / marilyngardnermilton This NASA/ESA Hubble Space Telescope image presents the Arches Cluster, the densest known star cluster in the Milky Way. via NASA http://ift.tt/1FHM6qV AdvertisementShare this:TwitterFacebookLike this:Like Loading... Related