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Panspermia (Gk. πάς/πάν (pas/pan, all) σπέρμα (sperma, seed)) is the hypothesis that "seeds" of life exist already all over the Universe, that life on Earth may have originated through these "seeds", and that they may deliver or have delivered life to other habitable bodies.
Exogenesis (Gk. "outside origin") is a more limited hypothesis that proposes life on Earth was transferred from elsewhere in the Universe but makes no prediction about how widespread it is. Because the term "panspermia" is more well-known, it tends to be used in reference to what would properly be called exogenesis.
Originally posted by mapsurfer_
Im not sure how anything alive would survive in space, but this definitely is thought provoking.