The prerequisite
for a spacemoving civilization is:

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} = (100300)·10^{9} · 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} = (100300)·10^{9} · 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:
6.6.2 Theorem 
There are probably 3 to 71
technological civilizations, on a "Earth
2", in a Sunlike star system, in our
galaxy, which operate interstellar space travel. 
The
probability of a habitable "Earth 2" in
solarlike 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 · (1:691:691) · 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.
