[LGM]

Originally posted by PvK:
I thought it was because it was just a cross-section of a single very thin spiral arm, rather than an entire spiral galaxy. Remember these are quadrants, not entire galaxies, although you can pretend if you want to. However, real galaxies have astronomically more systems than a quadrant, and are correspondingly larger, as well. A quadrant is just a speck compared to a whole galaxy.

PvK

A quadrant is a fourth of a galaxy, not a speck.