basic model" discussed in Chapters 1 to 7
can also be applied to systems that are not
similar to the sun. Equation 1.4.1 for solar-like
star systems can be generalized so that it
applies to any number of stars
of a spectral class in the galaxy.
to all star systems A in our galaxy, the
number NX of
a set of star systems results with:
FX is the
probability of the occurrence of a set of stars that have
a certain property.
A natural order of the stars is given by the system of
spectral classes.  The spectral class of the G stars
was already used in the special basic model.
Equation 8.1.1 therefore applies to the star set of any
spectral class. (see also chapter 12.1) This means that
the concept derived so far can be applied to all star
sets for which observation data are available.