Arches Cluster [SEP] constellation
Arches Cluster
The Arches Cluster is the densest known star cluster in the Milky Way located about 100 light-years from its center, in the constellation Sagittarius (The Archer), 25,000 light-years from Earth.
The discovery of this cluster was reported by Nagata et al. in 1995, and independently by Cotera et al. in 1996.
Due to extremely heavy optical extinction by dust in this region, the Arches Cluster is obscured in the visual bands, and is observed in the X-ray,
Fornax Cluster
The Fornax Cluster is a cluster of galaxies lying at a distance of 19 megaparsecs (62 million light-years). It is the second richest galaxy cluster within 100 million light-years, after the considerably larger Virgo Cluster, and may be associated with the nearby Eridanus Group. It lies primarily in the constellation Fornax, with its southern boundaries partially crossing into the constellation of Eridanus, and covers an area of sky about 6° across or about 28 sq degrees. The Fornax cluster is a part of