Life on earth, er outside the oceans would end with sterilization down to 1M. Likely 99.99% or more of humans dead within a year. Mars however is very cold, h

Life on earth, er outside the oceans would end with sterilization down to 1M. Likely 99.99% or more of humans dead within a year. Mars however is very cold, highly radioactive, practically no atmosphere, and vulnerable to meteor strikes. So to fix all those problems inhabitants would likely be under 1 meter to minimize air leakage, radiation, heat leakage, etc. So it might well be that 99% of people survive a 1M deep sterilization ... only if self sufficient, which does seem a stretch, at least for the next century.