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This is a simple exercise with dictionaries, and I feel like a good one to introduce the concept of validate input param in powershell.
The acceptable input for the planet parameter is a value in a short list of planets. With validateset, user can just using tab to cycle through the predefined acceptable values or tab-completion their input, behaving like a typical command line. Any other input value will raise an error.
I wonder if that would be enough hint or I should leave and extra comment explain how to set up the ValidateSet part.