Some discussion or other about the idea of silicon based life forms started me thinking:
What other forms are there that life could have taken.
I know that silicon life has been pretty much dismissed because of things like silicon dioxide being a solid whereas carbon dioxide is a gas and therefore easier to move about, but that strikes me as a rahter limited view; I’m not asking if you could re-engineer existing life with different elements, I’m asking if it’s concievable that other ways could exist.
Water? (I know water has some interesting and unique properties, but are there other suitable chemistries? (maybe involving molten metals or some such)?
RNA/DNA? (I’m assuming no Panspermia)
Chlorophyll?(are there other, perhaps better ways to trap radiated energy?
In essence, I’m asking how much commonality should we expect as default between ourselves and lifeforms from other planets (if we ever get to see 'em)? and is it possible that life might arise that is entirely different from our own?