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They had the "1 in 10" rule for intelligent life a long time ago.
Drake equation. Drake equation - Wikipedia
The Drake equation is:
N = R ∗ ⋅ f p ⋅ n e ⋅ f l ⋅ f i ⋅ f c ⋅ L
where:
N = the number of civilizations in our galaxy with which communication might be possible (i.e. which are on our 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 actually 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[5][6]
Heb 1 - NKJV/KJV
God, who at various times and in various ways spoke in time past to the fathers by the prophets, 2 has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds;
Heb 11 NKJV/KJV
3 By faith we understand that the worlds were framed by the word of God, so that the things which are seen were not made of things which are visible.
The arguments for alien life are all arguments from silence.
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Interesting summation
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