10-08-2016, 06:43 PM
Although Earth is not described in OA as being the result of naturally-occurring or directed panspermia, there are examples of both in the scenario; natural panspermia has happened to a limited extent in the cluster M67, for example, and in the Macrystis system, for example. Directed panspermia by aliens has happened in the so-called Garden of Paradise cluster and several other locations. But neither of these processes represent the norm.
In most cases the life that is found on the worlds of the Terragen Sphere has emerged there, from processes of abiogenesis; there are many different routes to abiogenesis, and it seems to be the case that every case of abiogenesis is unique; the number of possible biochemical signatures is so high that there could be a different biochemistry on every planet in the visible universe, purely by chance.
In most cases the life that is found on the worlds of the Terragen Sphere has emerged there, from processes of abiogenesis; there are many different routes to abiogenesis, and it seems to be the case that every case of abiogenesis is unique; the number of possible biochemical signatures is so high that there could be a different biochemistry on every planet in the visible universe, purely by chance.