Arlboro Globular Cluster

The Arboro Globular Cluster (UAS : AGC ) was known to United Earth astronomers as Messier 54 ( or as M54 or NGC 6715) and it is is a globular cluster in the constellation Sagittarius.

Previously thought to belong to our galaxy at a distance from Pluribus of about 50,000 light-years, it was discovered that M54 most likely belongs to the Sagittarius Dwarf Elliptical Galaxy (SagDEG ), making it the first globular cluster formerly thought to be part of our galaxy reassigned to extragalactic status, even if not recognized as such for nearly two and a quarter centuries.

Recent more accurate measurements and the expediton that went there place M54 at a distance of some 87,000 light-years, translating into a true radius of 150 light-years across. It is one of the denser of the globulars, being of class III (I being densest and XII being the least dense). It shines with the luminosity of roughly 850,000 times that of the Sun and has an absolute magnitude of −10.0.

As it is located on SagDEG's center, some scientist think it actually may be its core; however the Arl and the Boro  have proposed that it is a real globular cluster that fell to the center of this galaxy due to decay of its orbit caused by dynamical friction.

The Arlboro Cluster was first visited by a Long Range Expedition in 5012  and were greeted by a fleet of ships of the Arlboro Hegemony. After the Union visitors convinced the Arlboro that they were not the Y'All, the Arl and the Boro invited the members of the Expedition to their coreworld.

The Arlboro Hegemony and all its 19 members joined the Union in  5020 . Eight more societies have joined the Union since then. A "small" bridge consisting of 28 Gigamon stations, called the Arlboro Connection connects the Cluster with M-0. It is a busy connection and the Arlboro communities have integrated fast, in part due to their tech almost at the same level with the Union, prior to joining.

There are 11,534 systems registered as Union systems, a Space Train network is still under development but already connects 400 systems.