Probabilities in the Galaxy
A Distribution Model for habitable Planets
Copyright © Klaus Piontzik Claude Bärtels

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2.7 - Conventions and Notation

In the following chapters planets are classified into these six categories:

2.7.1 Definition Planetary Categories
h planets in (h)abitable zones
hsup (h)abitable (Sup)erearth
hsub (h)abitable (Sub)earth
g approximatly earth-(g)reat planets
can be up to 4 times larger than the earth
a (a)pproximatly earth-like planets
Rotation time, orbital time deviate from the earth
Mars belongs in this category
e habitable, (e)arth-like planets („Earth 2“)

The indices in all equations and considerations of this book are formatted, with the following meanings:

2.7.2 Definition Indices
s (s)unlike
p (p)lanet
h (h)abitable zone
sub (Sub)earth
sup (Sup)erearth
g approximatly earth-(g)reat
a (a)pproximatly earth-like
e (e)arthlike
L (L)ife
i (i)ntelligent species
z civili(z)ation
u s(u)rvive civilization
m hu(m)an, humanoid
x not sunlike
RD (r)ed (D)warfs


Convention: In the case of sun-like systems, the index s may be omitted, since the non-sun-like systems are marked by an x.


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