A significant part of that is because it’s much further from the sun. A hypothetical 500 day mars mission is ~1 Sv optimistically which is something like 5% fa

A significant part of that is because it’s much further from the sun. A hypothetical 500 day mars mission is ~1 Sv optimistically which is something like 5% fatal cancer risk. A 3 year mission you’re well above that even before considering solar storms etc. I think many would sign up for a mars mission especially as treatment improves, but there’s only so much wiggle room here.