The one thing here that always captures my attention, when people surmise about the conditions of life and it's possible niches in the universe and it's possible locations due to favorable positions temperate of it's necessities.<quoted text>
Like a solar system, it seems that a galaxy has a goldilocks zone. Too close to the centre the star density is too high and radiation levels would be lethal to organic life. Too far away and there are not the heavier elements (iron, carbon, calcium etc) required for planet building and life, about 2/3rds of the way out seems to be just right.
Recent research suggest that just over 1% of stars are/have been capable of supporting planets with complex life.
1% of approximately 10^24 stars in the universe is still 10^22 stars capable of sustaining complex life in its solar system. Thats an awfully big number of potentials by anyones standards.
You may find these interesting.
Is that it could be found these conditions maybe completely different for some other life drastically different from the chemistry we are composed of. Have you ever thought about that?
That there could be life so alien to our understanding that the rules we think of and impose on it in searching for similar type life forms may not even be necessary. One idea that has taken root in scientific circles is that water being a solvent and reducing agent , could in fact be replaced by some other liquid in the criteria for the formation of life.