  Just a few decades after the discovery of the Charon Relay, and the ensuing
First Contact War, relatively little is known about the population of planets
linked by the Prothean mass relays. Understanding the nature of these systems
and how they may differ from the broader population of planetary systems in our
galaxy is key to both continued human habitation across the broader Galaxy, as
well as to our understanding of the Prothean civilization. What factors
motivated their choices of planetary systems? Characterizing these systems
allows us to peer into Prothean society and culture, and make inferences about
the preferences that drove their expansion throughout the Galaxy. In this
study, we undertake a broad analysis of the systems recorded in the Systems
Alliance Planetary Survey, examining their dynamical stability, orbital
properties, and the climates of the inhabited worlds. We find that the Alliance
data is inconsistent with both a modern understanding of planetary system
dynamics, as well as with our understanding of Earth-like climate dynamics. We
suggest this is due in part to security-related data obfuscation by the
Alliance, and in part due to the real preferences of the Protheans.
