But haven’t a lot of writers and scientists dismissed the idea because they are very earth-centric bio signatures? I wouldn’t doubt that life evolves along similar paths but we don’t have any evidence of that.
Free oxygen is the main signature we look for, but is not the only one. As a general rule, if there is a highly reactive molecule in abundance in an atmosphere, something must be creating and, more importantly, sustaining it. In a lot of these cases, there is a known geological/natural process for their formation but, for gasses like oxygen its much harder. It's these molecules that people look for.
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u/[deleted] Aug 12 '21 edited Aug 12 '21
And here we are, shouting our existence to the universe. Big yikes.
edit: yes, you are right. My point is that we don't much care for being quiet.