panspermia

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pan·sper·mi·a

, panspermatism (pan-sper'mē-ă, -sper'mă-tizm),
The hypothetical doctrine of the omnipresence of minute forms and spores of animal and vegetable life, thus accounting for apparent spontaneous generation.
[pan- + G. sperma, seed]

panspermia

(păn-spûr′mē-ə)
n.
The theory that microorganisms or biochemical compounds from outer space are responsible for originating life on Earth and possibly in other parts of the universe where suitable environmental conditions exist.