NASA has a mission protocol which says that if a Low Earth Orbit mission increases the lifetime risk of the crew getting cancer by more than 3% they wont go ahead with it but the upcoming mars missions may expose the crews to levels that would be beyond that limit and other hazards, so how dangerous is deep space travel to Mars and beyond.

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With Elon Musk pushing to get men on Mars by the mid 2020s and NASA looking to do the same for the 2030s, just how much have we learned since Apollo and from the space stations.50 years on from the beginning of the Apollo missions and we have yet to send any man back to the moon let alone on the much more arduous journey to our nearest viable planet Mars.Now whilst much of this has been lack of political will in the face of our own manmade problems here on earth, its also down to the increasing sophistication of robotic probes and landers and that they are much cheaper to make, launch, can go where no man could and can continue working for sometimes years at a time, the Voyager probes are still going 40 years after their launch. If we relied on manned discovery only we would know a fraction what we do now.With data from the probes which we have sent around the solar system since then, we have built up a picture which is far from the vision of just whizzing through inter planetary space. That and along with the joint NASA Russian experiment of having men in space for a year onboard the ISS, we now have a much better understanding of what they may experience on the two and half year round trip to Mars.

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How Dangerous is Deep Space Travel to Mars and Beyond ?