The Biosphere will soon expand out into the Solar System. In fact, thinking back to microbes on current and past Mars landers, it probably already has. So what new selection pressures will come into play? How will history and contigency play out over that much larger system?
I write these words, thinking in the context of the delta variant of SARS-CoV2 and its phenotype trajectory as a function of mRNA vaccine “attack landscapes”. The virus now responds to entirely new selection pressures correct? So too, microbes on Mars would be subject to entirely new selection pressures (e.g. extreme temperatures, low atmospheric density, radiation).