"Galactic" refers to anything related to a galaxy, which is a large collection of stars, gas, and dust held together by gravity. It describes things that happen on a grand scale in outer space. Full definition
Region in galactic center containing the Arches Cluster and Bubbles, the Quintuplet Cluster, and the Pistol Nebula and Star (more from Andrea Moneti) and Moneti et al, 2001). (members.nova.org)
The team's observations help shed light on the nature of ULXs, and impact our understanding of how supermassive black holes in galactic centers are formed and how matter rapidly falls onto those black holes. (sciencedaily.com)
Originally, Shaya and colleagues were looking for active galactic nuclei in their Kepler data. (jpl.nasa.gov)