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Apart from high intelligence, good qualifications and an excellent level of fitness, astronauts must have a strong character. They also have to be very courageous in order to accept the high risks involved.
Astronauts also have to face other, more ordinary problems in space. What can be very annoying is the limited variety of food, but the greatest challenge is getting along with other members of their team as they often come from different countries, with different backgrounds and habits. Therefore they must be very patient with each other, since the lack of privacy can become irritating.
All in all, it seems that being an astronaut is one of the most challenging jobs in the world.
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