According to Theorem 15.3.5, up to
14 old civilizations could exist in the galaxy. It cannot
be excluded that these civilizations have also founded
daughter civilizations in other planetary systems.
Daughter civilizations are only possible from
interstellar level (8). One would have to define what is
decisive for the establishment of new civilizations, i.e.
what set of conditions must be fulfilled.
.
 Resources on the
initial planet
 The will to create a
daughter civilization
 Interstellar space
travel
 Planetary conditions
on the target planet
 Raw materials on the
target planet
 Environmental
conditions on the target planet
 Technology to keep at
least 10000 living beings alive
 Organization to manage
such a community of life
Daughter civilizations depend on v
conditions.
I.e. they form the set V of civilization
prerequisites for daughter civilizations.
Then each element contributes to the overall probability.
A differentiation of the individual parts is still
obtained by weighting the individual
elements.
The total probability of establishing a subsidiary
civilization is then the sum of the weighted individual
probabilities.
17.3.1 Equation 

An expansion rate for civilizations can
thus be defined:
17.3.2 Definition 
E_{Civ}
= colony/century 
Then the overall probability for a daughter civilization
can be converted into an expansion rate for civilizations
as follows:
17.3.3 Definition 
E_{Civ}
= y_{Civ} ·
F_{Tochter}
with 1 < y_{Civ}
element of real numbers 
This results in the number of daughter
civilizations in a period of T
17.3.4 Definition 
N_{Daughter}
= T · E_{Civ}
_{
}N_{Daughter}
= T · y_{Civ} ·
F_{Daughter} 
That goes for one civilization. Now the
sum of all old civilizations has to be made to get the
total number of daughter civilizations in the galaxy.
17.3.5 Equation 
N_{DaughterAll}
= &sum N_{Daughter}
= &sum T · E_{Civ}
= T ·&sum E_{Civ
}N_{DaughterAll}
= T ·&sum (y_{Civ} ·
F_{Daughter}) 
Then is the total number of daughter
civilizations in the galaxy within the time span
T
17.3.6 Equation 

A simple rough calculation can be made. According to
Theorem 15.3.5, up to 14 ancient civilizations could
exist in the galaxy. If each produces 1 to 2 daughter
civilizations per century, that is a maximum of 30
colonies per century. After 1000 years there are about
300 daughter civilizations and that is exactly as many
civilizations as there are already. (According to Theorem
15.3.2 there are 336 technological civilizations).
An old civilization that forms expansive daugther
civilizations would, after a few thousand years, have
populated larger parts of the galaxy, with at least one
hundred planetary systems.
If a civilization has a long history of
interstellar spaceflight, it is quite possible that it
will go all the way into space. It can therefore be taken
into account that extraterrestrial civilizations exist
that prefer life in space, on their generational
spaceships or flying cities or the like on planets. So
also create additional homes
Civilizations that are technologically advanced enough
could not only colonize planets similar to the home
planet, but could also do geoengineering
or terraforming. So make planets fit.
All in all, old civilizations have a multitude of
dispersal possibilities. According to Theorem 15.3.4, 82
space travelling civilizations are added to their larger
areas. Therefore, most of the space in the galaxy is
likely already occupied. On the basis of the data in this
book, a rough estimate can be made.
According to Theorem 15.1.2, between 5,748 and 9,642
uninhabited, but animate earthlike planets could exist
in the galaxy. Thus rounded 5000 to 10,000. The mean
distance of these systems to each other then amounts to
13601700 light years.
According to Theorem 15.3.5, up to 14 ancient
civilizations could exist in the galaxy. If each of them
has founded 100 daughter civilizations, that is already
1400 systems. In addition, according to Theorem 15.3.4,
there are 82 spacefaring civilizations. Makes a total of
1500 inhabited star systems rounded. Then each system has
a latitude or terretorium of 2560 light years.
Our terretorium would therefore only contain one
uninhabited planet similar to Earth. I.e. for larger
expansion plans of mankind in the galaxy it will not be
easy or not possible at all, because in worst case too
little free space is available.
A consequence of this galactic civilisational situation
is that something like a galactic order must exist in
which each species at least recognises the space of
another species. As in any association, individual
parties will have formed here as well. They act with each
other or against each other.
As galactic freshmen, we don't know which interest group
an alien belongs to. Therefore, future encounters (e.g.
of the third kind) should be made with caution. You never
know who you're dealing with. For reasons of
selfpreservation alone, we should be suspicious of alien
civilizations.
