Human Factors in Long-Duration Spaceflight

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A manned mission to Mars is an extremely dangerous excursion. Crewmembers can expect a six-month flight to the planet, one year of occupation, and a six-month travel back. During this period, numerous human factors challenges can complicate, and even ruin the entire mission. This paper will identify human factors challenges the crew will face, describe why they are so dangerous, and finally, identify ways to mitigate these challenges.

The first challenge in a long-duration spaceflight is almost immediately apparent after lift-off, leaving the gravitational pull of Earth, and entering a micro gravity environment. Weightlessness can have several different impacts on the human body. Astronauts who orbit the Earth on the International Space Station (ISS) already experience these effects, and those missions are not nearly as long in duration. First, the micro gravity environment causes osteoporosis to set in. Osteoporosis is the loss and weakening of the bone structure. In fact, every month of spaceflight equates to about 2% loss in bone structure ("Space Odyssey," n.d.). At a bone loss rate of 2% per month of flight, a Mars mission crewmember could lose almost 25% of their bone mass just going to and coming from Mars. Another risk of micro gravity is muscle loss. Muscles experience no resistance in micro gravity, so they begin to waste away. A strong, physically fit astronaut could have the body of and old man by the time the mission on Mars began. This would make performing any duty outside of just being able to walk around an extreme challenge (Wall, 2010). The symptoms of weightlessness do not disappear once the crew begins its mission on Mars. The gravity on Mars is much less than it is on Earth. For example, ...

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