Part of the problem of long-distance manned space voyages is that of the amount of consumables that would need to accompany the astronauts on their journey would add a significant amount of mass to the ship spacecraft, requiring more fuel for the trip to haul the extra food, water, etc., with that fuel adding yet even more weight to the craft -- needless to say, sending humans to another planet would be a resource-expensive endeavor. One solution often used in science fiction is to place the space travelers into suspended animation, typically in a state of biological suspension akin to a deep sleep.
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