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with the history of space missions, im sure most astronauts would have come to terms with the fact they may not survive, that it could be a catastrophic failure. im sure the suicide mission scenario would be more of a problem for NASA than for the astronaut, as im not sure what people would think and what laws would apply when it comes to sending someone out to mars to die...
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The difference is though that the trips to the Moon had all intentions of getting the astronauts back safe and sound, and relatively soon. Going to say... Io would practically be throwing your life away. Even if you do survive and slingshot back home, what will you be coming back to? Your body has probably sustained serious SAS and everyone you left will have most likely moved on. Mars is much more practical, but still a bit timely compared to the Moon... but chances are their families will still be together and intact when they get back. It'd only be a few years at the max, comparable to deploying a soldier, imo.