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1. What are some of the dangers that can kill Mark as he is stranded on Mars?

There are many ways that Mark can die. If the oxygenator breaks down, he’ll suffocate. If the water reclaimer breaks down, he will die of thirst. If the Hab breaches, he’ll explode. If none of those things happen, he will run out of food and starve to death.

2. What’s the situation with food supplies for Mark when he is stranded?

Mark’s mission lasted six days. The mission had enough food to last the entire crew fifty-fix days. So there was still enough food to feed six people for fifty days. For just Mark, that much food would last three hundred days even without rationing.

3. Why does Mark have a good supply of EVA suits?

Each crew member has two space suits: a flight spacesuit to wear during descent and ascent, and the bulkier and more robust EVA suit to wear during surface operations. Since the crew wore their flight suits, Mark has six EVA suits in perfect condition.

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