> The apprehension of biosignatures – indications of life in exoplanetary atmospheres – would demand a reordering, not only of how humans perceive the Universe,

> The apprehension of biosignatures – indications of life in exoplanetary atmospheres – would demand a reordering, not only of how humans perceive the Universe, but of ourselves as living, if perhaps not lonely, beings within it. I don't see why. It seems so unlikely that out of the billions of planets out there, ours is the only one that has managed to produce a bacterium. Given that, I do not understand why actually discovering one (which, to be frank, I am not expecting to happen) would "demand a reordering, not only of how humans perceive the Universe".