A new study of the radiation risks to astronauts on an 860-day round trip mission to Mars, including 500 days on the planet's surface, suggests those risks are manageable. This study is not the final word on the subject, of course, but it is encouraging to advocates of manned missions into deep space.
Another factor: Radiation is dangerous to humans because it can cause cancer. If the treatment of cancer advances over the next several years to the point that at least most cancers have become manageable diseases, as some experts project, a higher risk of cancer by the time we are ready to send people to Mars might become acceptable.
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