Astronautics Interview Question:

Do you know why can anyone not go in space with everything he needs and explore all the planets?

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To go to mars would take at least a year. You would need to take in your spaceship all the air, food and toilet paper for a year. Right now you would need such a big, heavy spaceship that you could not launch it. So people are finding ways to reduce the weight for instance you can use plants to help generate the oxygen you need to breathe. Also we worry about what will happen to people who spend so long in weightlessness. Their bones may become so soft that they will not be able to stand up on mars to walk around and explore.
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