Answer: When you land on a different planet. You surely would face problems as it is a different world.
Explanation: There would be no familiar faces to communicate with you. There will be more dangers awaiting for you, as you are not familiar with the places. Sometimes you would have to starve and get exhausted. You would have to search for shelter and water for living. If you want to live in there, you have to cooperate with the environment.
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