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- Panspermia - Panspermia is the hypothesis that "seeds" of life exist already in 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.
- Cosmic ancestry - Cosmic ancestry is a hypothesis of the origin of life on Earth, based on the panspermia views of Fred Hoyle and Chandra Wickramasinghe and further developed by Brig Klyce. It incorporates strong panspermia, the Gaia hypothesis and the premise that life has no primary origin.
- Intervention theory - The intervention theory of the origin of terrestrial life is a group of alternative hypotheses of the origin of life on this planet. Intervention theories postulate that life was deliberately introduced to this planet by intelligent extraterrestrial beings - contrast this with panspermia theory, which hypotheses that simple life was introduced to Earth through unintelligent mechanisms.
- Exogenesis (Babylon 5) - Exogenesis is an episode from the third season of the science-fiction television series Babylon 5. (For the scientific theory of exogenesis, see panspermia.