Using the Stellar Cartography room is the key to tracking down the loony scientist and his star-busting weapon. The red line will show the current path of the Nexus, but by selecting a star and running a simluated destruction you can see just how the collapse of a star will affect the path of the energy ribbon and whether Soran is likely to arrive at this planet in the future. But as there are only a few destinations, he's bound to turn up at all of them at some point.
