6.6.1 Axiom There is a physics and resulting technology that allows interstellar journeys in short periods of time.

From a developmental point of view, only the highest level of civilization 8 has interstellar space travel. Therefore, the probability of finding such a species is:

F_z = 14,400:7,301 : 64.= 225:7,301 = 1:32.448

F_Liz = F_L · F_i · F_z = 1:9 · 1:14 · 225:7,301 = 1:4089 space traveling civilizations

Inserting all values (F_e = 0.1) into equation 6.3.3:

N_ze1 = (100-300)·10⁹ · 1:15,000 · 1:69 · 1:4089
N_ze1 = 24 – 71 space traveling civilizations

Inserting all values (F_e = 0.01) into equation 6.3.3:

N_ze2 = (100-300)·10⁹ · 1:15,000 · 1:691 · 1: 4089
N_ze2 = 3 – 7 space traveling civilizations

The two results can then be summarized to the following statement:

The probability of a habitable "Earth 2" in solar-like star systems, in our galaxy, with a technological civilization operating interstellar space travel, is then by definition 6.4.2:

F_ze = F_sph · F_gae · F_Liz
F_ze = 1:15,000 · (1:69-1:691) · 1:4089
F_ze = 1:4,232,115,000 – 1:42,382,485,000

Only every 4.232 to 42.382 billionth star system has an "Earth 2" with a space traveling civilization.