Comment Re:It is staggering how much has to come ... (Score 1) 49
The problem with better DNA error checking is you risk choking off evolutions necessary source of entropy, and if that life can't evolve, it wont do well protecting against OTHER threats.
The conclusion would be that while too much radiation precludes evolution, (as it requires too heavy "error checking"), too little radiation also precludes evolution (no errors means no changes) and therefore there has to be a 'just the right amount', making that yet another constraint , in this case magnetic, on what sort of environment qualifies as the "goldilocks zone" for life.