The simulation depicts the expansion of a technological civilization through the Milky Way, created along lines previously described in the literature. What we are looking at is the transition between a Kardashev Type II civilization, and a Type III, which has spread throughout the galaxy. This might be a fast process considering the motions of stars themselves, which would overcome the inertia of slower growing settlements and boost expansion rates. Issues like starship capabilities and the lifetime of colonies come into play, but the striking thing is how fast galactic settlement occurs and how the motions of stars factor into the settlement wave. The parameters are everything, and they’re interesting:

• Ships are launched no more frequently than every 100 ka;
• Technology persists in a given settlement for 100 ma before dying out;
• Ship range is 10 light years.
• Ship speeds are 10 km/s; Voyager-class speeds.
• The simulation covers 1 ga

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