Humans currently have zero use anywhere but on the surface of the planet they are adapted to, Earth. We are far more expensive to support, and improve far more slowly than robots. We are just starting to understand how much robots and artificial intelligence can do, but their capability doubles every two years. Human ability has hardly changed for 200,000 years. Sending humans to Mars is silly. We can just barely survive for a day or two atop Mt. Everest and nobody wants to live there! But we badly need to learn what we can from other planets and robots are obviously the cheapest way to do that.
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