Panspermia implies that civilizations will appear earlier, because the number of planets with life is growing exponentially. This also means that first civilizations will likely be of approximately the same age. This idea was used by the proponents of SETI as justification of the search of radiosignals inside our Galaxy.
Panspermia implies that civilizations will appear earlier, because the number of planets with life is growing exponentially. This also means that first civilizations will likely be of approximately the same age. This idea was used by the proponents of SETI as justification of the search of radiosignals inside our Galaxy.