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

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2.2 - Subearth

Subearth Subearth are planets that have a smaller mass than Earth and are smaller in size. According to the Habitable Exoplanets Catalog, December 2017, there is one Subearth among 53 habitable planets. This corresponds to a share of 1.886%. The probability factor is thus Fhsub = 0.018,867 = 1:53.
2.2.1 Theorem 1.886 % of all habitable planets, in solar-like star systems, are probably subearths.

Then equation 1.6.1 can be modified for solar-like star systems that have habitable planets and a relationship for subearths can be derived.

Related to all star systems A in our galaxy, the numberl N
hsub of the G-star systems, with habitable subearths, results to:

2.2.2 Equation Nhsub = Nh · Fhsub
hsub = A · Fsph · Fhsub

Starting point are 100-300 billion solar systems in the galaxy, and inserting into equation 2.2.2 provides:

2.2.3 Theorem There could be 125,786 to 377,358 habitable subearths in solar-like star systems in our galaxy.

The probability of habitable subearths in solar-like star systems, in the galaxy, is then:

2.2.4 Definition Fsub = Fsph · Fhsub

Fsub = 1:15,000 · 1:53
sub = 0.000,001,258 = 1:795,000

Among about 795,000 sun-like star systems there is one with a habitable subsoil.

In principle nothing speaks against the fact that life can also develop on subearths, at least in the form of flora. It is doubtful, however, because of the low gravity and size only a thin atmosphere can form, whether on such planets really higher life, intelligence and civilization can develop.


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