It's truly fascinating to take an astronomy course and be exposed to all these "tricks of the trade" for the first time. It's mind boggling how much one can learn by studying a weak little trickle of photons coming in from a distant star. But it shouldn't surprise us; humans are very smart and have been working on these astronomical problems for thousands of years. And it's incredible how much they've figured out!
I'm just guessing that I've taken more "astronomy" courses than you, your smarmy attitude notwithstanding.
I ask what gasses there were that betray signs of biological activity, and you want me to go off to some government link.
Simple question. Name two such gasses, and whether the quantities were measured and relevant.
ML/NJ