As we continue our look at Generation Ships, vast vessels designed to carry many thousands of colonists to distant and alien worlds centuries away, we must ask just how far and how long such ships can be made to last? Can space ships be made that will endure even longer voyages of thousands or even millions of years in the void of interstellar or even intergalactic space? Will ships, and their crews, fall apart or turn into Cargo Cults who no longer remember how their technology functions or what their mission was?