Galaxy of Life

The Galaxy of Life is the galaxy in which the Earth is located. It is home to nine non-terrestrial civilizations, as well as the Human Republic, and the Noveratu Empire. There are over a dozen species of spaceborne life-forms living in the Core of the Galaxy of Life.

Overview
From A Brief History of History, the first Source Book.

''The Milky Way Galaxy, as it was known to human science through the majority of history, is known by many names by many different alien races. The most common, and the one used by the Human Republic's official documentation, is the Galaxy of Life. Many other galaxies have been visited, most of them orbiting our own, and none of have offered any sign of life at all. By contrast, our own galaxy appears to be rife with living creatures.''

''Mostly just called “the Galaxy”, the stellar body in which all known life resides is rather smallish compared to the other major galaxies in our region. It is, however, large enough to attract satellite galaxies, which orbit outside the most distant arms of the Galaxy. It is most dense in the center, and least dense at the edges. The distance between celestial bodies in the arms may be as great as several dozen lightyears, whereas in the Core the bodies are so close together that they in fact constitute a single, contiguous ecosystem.''