outline of the basic plan the Celestials follow for shaping the evolution of life on a chosen planet after it develops primitive sentient life.

This First Host of Celestials is made after the chosen planet has been judged to possess the needed properties for an effective "seeding". The Celestials then return for follow-up visits or "Hosts", during which they monitor the subject planet's progress and make whatever modifications or interventions they deem appropriate. During the First Host on Earth, the Celestials begin genetic experimentation