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Used when the question pertains to how practical something is. It will also include an economic review of the what is being considered. It may be possible for something to be technically possible but the cost might be prohibitive.
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Why haven't we returned samples from Mars?
So far, we have gotten rovers on Mars to take samples and analyze them and send data back to Earth. However, why haven't we gotten a rocket to land on Mars, collect a sample, and blast it off back to …