Westhaver Equation
First, consider the Drake Equation:
https://en.wikipedia.org/wiki/Drake_equation
The Drake equation is:
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where
N = the number of civilizations in the Milky Way galaxy with which communication might be possible (i.e. which are on the current past light cone);
and
R∗ = the average rate of star formation in our Galaxy.
fp = the fraction of those stars that have planets.
ne = the average number of planets that can potentially support life per star that has planets.
fl = the fraction of planets that could support life that actually develop life at some point.
fi = the fraction of planets with life that go on to develop intelligent life (civilizations).
fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space.
L = the length of time for which such civilizations release detectable signals into space.
This form of the equation first appeared in Drake's 1965 paper.
Westhaver Equation principle:
There is no evidence of intelligent extraterrestrial life. There is only speculation and numerical conjecture. The evidence is clear. Only one planet possesses intelligent life. Earth.
Therefore: N = 1.
So, the Drake equation is missing factors that have the effect of reducing the calculated N to 1. It is proposed that there needs to be sufficient factors, possibly some of which are as of yet unknown, that in totality, yield N = 1. That is what the evidence shows.