Sphere of Influence
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A race's Sphere of Influence (or SoI) is an area shown on the HyperSpace starmap roughly indicating territory controlled by that specific race. The center of the circle is the approximate center of the race's forces and the size of the circle indicates their military strength. Battle groups from that race will also proceed to chase any alien vessel that traverses their Sphere of Influence. If the interloper leaves the Sphere of Influence, any pursuing battle groups will eventually break off pursuit and vanish from the tactical display.1 The exceptions to this rule are the Slylandro Probes and the Melnorme which can appear anywhere in HyperSpace.
A player can effectively watch an entire race move by entering and exiting his Map, as the displayed spheres will move upon opening it each time (though the actual Spheres of Influence move independently of this). Notable examples of this movement are the movement of the Pkunk to rejoin the Yehat, the movement of the Ilwrath to attack the Thraddash, the Supox and Utwig offensive against the Kohr-Ah, the Mycon Birthing Fleet's voyage to implant a Deep Child beneath the crust of Organon I and the Kohr-Ah after they win the Doctrinal War and begin their Death March.
TODO: Add the location and size of each SoI. Do this for each race page, too.