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It is not known when this will happen. But if it does it will be a long difficult task keeping the astronauts fit and healthy. The journey would take 9 months one way, and then there is the length of time spent on or near the planet. Bones and other body systems will weaken, supplies of food and other necessities will have to be brought, as well as systems to replenish and clean the air. Astronauts will be exposed to radiation no matter how well insulated the ship is. As exciting as manned space travel is, we would greatly benefit if initial explorations of the planets were done with unmanned probes. This might be the best approach at least for the next several decades, until we can master vehicle systems that will make manned missions efficient. With unmanned probes, all of the mass, engineering and fuel needed for basic life support can be eliminated or replaced with science systems. Robot systems will get better and better, and we don't have to worry about how to process a robot's urine or other wastes.

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