Librarian's note: See alternate cover edition of ASIN B073VBBRJP here. On this lush planet, intelligent life has just begun to bloom. One night on their annual migration, a hunter-gatherer clan notices a new light in the night sky that they cannot identify. Though they don't know it, they have spotted a supermassive asteroid that is on a course to be trapped into orbit by their sun. As it passes a hair's width from their planet, the asteroid's terrible gravity triggers widespread ecological mayhem: oceans heave with megatsunamis, noxious gases fill great swaths of land and sea, and terrible earthquakes roil its tectonic plates. The world as its inhabitants knew it is gone - forever. So begins the orbit of the great asteroid, whose transit past this planet every 2,276 years scrambles the planet's ecology, and in so doing, dashes lives, empires, and destinies. Each time, life on the planet stubbornly clings to existence, but must find a new way to persist as the world it once knew is irreparably changed. Across the ages, women and men of all stripes - farmers and merchants, scientists and priests, slaves and explorers - must all find a way to survive as Tyo, the great asteroid, grows into mythology and defines history itself.