panspermianoun [ U ]
uk/pænˈspɜː.mi.ə//pænˈspɝː.mi.ə/the theory that very small organisms or chemicals that begin life can be found everywhere in the universe and that they made life on earth begin:
The theory of panspermia - germs or spores spreading life through the universe - was touted by the late Nobel laureate Francis Crick.