Seeding theory

지구에 존재하는 생명의 기원이 지구가 아닌 외계라는 가설:

According to seeding theorists, life did not originate on earth. In one version of this theory the seeds of life arrived on earth via a meteorite. In a second version of seeding theory extraterrestrial intelligent beings came down from other planets or galaxies and planted the seeds of life on earth. Regardless of the origins of the seeds, however, evolution by NaturalSelection presumably took over, and the seeds eventually evolved into humans and the other extant life forms observed today. —p38, Evolutionary psychology