Imagine. 250,000 years of human civilizations and conquest of the cosmos. Entire civilizations have come and gone, lasting hundreds, occasionally thousands of years. Some evolving. Some ending in bloody revolution. Most destroyed by the very cosmos they sought to inhabit. Yet now, in a future far removed from humanity's cradle. Millions of civilizations, and trillions upon trillions of human descendants inhabit the galaxies that their ancestors once...