The late Nobel prize winner Professor Francis Crick, OM FRS, along with British chemist Leslie Orgel proposed the theory of directed panspermia in in a meteorite. As an alternative to these nineteenth-century mechanisms, we have considered Directed Panspermia, the theory that organisms were deliberately. In , Francis Crick and L.E. Orgel published a paper in Icarus journal, suggesting a new hypothesis for the origin of life on earth, which they called as.
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Directed panspermia is the idea that life might have been intentionally spread throughout space and seeded on the surface of other worlds by a guiding intelligence.
A detailed version of this hypothesis was put forward in by the molecular biologists Francis Crick codiscoverer of the structure of DNA and Leslie Orgel. The probability of successful seeding would be greatly increased, they pointed out, if the fertilization were carried out deliberately by an existing technological civilization.
Their panspermka depended first upon demonstrating that it was possible for an advanced extraterrestrial civilization to have developed in the Galaxy before life first appeared on Earth.
This they were able to do see extraterrestrial civilizations, ancient. As for the means of dispensation:. The spaceship would carry large samples of a number of microorganisms, pansperma having different but simple nutritional requirements, for example, blue-green algae, which could grow on CO 2 and water in “sunlight”.
A payload of 1, kg might be made up of 10 samples each containing diredted 16 microorganisms, or samples of 10 15 microorganisms. Crick and Orgel further suggested that directed panspermia might help resolve one or two anomalies in the biochemistry of life-forms on Earth.
Abiogenesis and Directed panspermia
One of these was the puzzling dependence of biological systems on molybdenum. Many enzymesfor example, panspermix this metal to act as a cofactor.
Such a situation would be easier to understand if molybdenum were relatively abundant on Earth see elements, terrestrial abundance. However, its abundance is only 0. Crick and Orgel commented:.
If it could be shown that the elements represented in terrestrial living organisms correlate with those abundant in some types of star-molybdenum stars, for example-we might look more sympathetically on “infective” theories. A second example they give concerns the genetic code:.
Several orthodox explanations of the universality of the code can be suggested, but none is generally accepted to be completely convincing.
It is a little surprising that organisms with somewhat different codes do not coexist.
The universality of the code follows naturally from an “infective” theory of the origin of life. Life on Earth would represent a clone derived from a single set of organisms. There might be a variety of reasons why an advanced civilization would wish to intentionally initiate life elsewhere: As for the means of dispensation: Crick and Orgel commented: A second example pansoermia give concerns the genetic code: