So, perhaps the Drake equation...
...can now be further extrapolated along the lines of...
"N = the number of civilizations in our galaxy with which communication might be possible (i.e. which are on our current past light cone);
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"
So, perhaps we need to add in:
a) = the fraction of dust particles that have an alkaline composition that turn into clumps of material
b) = the fraction of clumps of material that have sufficient water within it
c) = the fraction of water-laden alkaline clumps that just happen to land on a primordial world in an area of space where water is liquid
It truly does begin to look like we do live in a very "Goldilocks" zone, where despite all the likelihood of life NOT forming, on Earth it did.