And so when it comes time when we find gases in exoplanet atmospheres that we won't know if they're being produced by intelligent aliens or by trees, or a swamp, or even just by simple, single-celled microbial life.
Y así, al toparnos con los gases en atmósferas de exoplanetas que no sabemos si los producen extraterrestres inteligentes o árboles, o un pantano, o incluso solo vida microbiana simple, unicelular.