Equation 7.3.1 contains all planetary, biological and civilizing factors that can influence the development of a civilization, by an intelligent species, on an "Earth 2", in a solar-like star system, in our galaxy.

It can be assumed that ancient civilizations emerge from the multitude of space traveling civilizations. Therefore F_z = 225:7,301 and F_Liz = 1:4089.

Inserting all values (F_e = 0.1) into equation 7.3.1:

N_ue1 = (100-300)·10⁹ · 1:15,000 · 1:69 · 1:4089 · 1:6
N_ue1 = 4 – 12 „Earth 2“ with old civilizations

Inserting all values (F_e = 0.01) into equation 7.3.1:

N_ue2 = (100-300)·10⁹ · 1:15,000 · 1:691 · 1:4089 · 1:6
N_ue2 = 1 – 2 „Earth 2“ with old civilizations

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

The probability of a habitable "Earth 2" with an old technological civilization in solar-like star systems, in our galaxy, is then:

F_ue = F_sph·F_gae·F_Liz· F_u
F_ue = 1:15,000 · (1:69-1:691) · 1:4089 · 1:6
F_ue = 1:25,392,690,000 – 1:254,294,910,000

Only every 25.392 - 254.294 billionth star system has an "Earth 2" with an old technological civilization.