The Snow Dog: They'll be a lot closer to home if something goes wrong and they can glean the same scientific knowledge that they could from a loop-the-Mars mission
Arthen: After that much time the skeletal and muscular adjustments due to low gravity would mean you wouldn't be able to come back to earth. After half a year in orbit and four hours a day of heavy exercise the risk of heart attack, stroke and bone breakage is severe.
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