The invention of the Azimuth-Pizarro Drive creates a new way for mankind to spread out into the galaxy--by installing the drives into huge asteroids, these planetoids become generation ships, taking centuries to get to suitable planets while the humans onboard live out their lives. But over decades upon decades of time, knowledge can be gained and lost, cultures can grow and die, and memories can be distorted. A ragged band of scientists and historians are trying to keep the dream alive; this is the story of one of them...