I don't think you're following my line of reason. You and I believe that red point is a planet because someone else taught us that. We don't have any independent evidence -- we simply believe what others have told us. I'm not arguing about the definition of a planet, or what 'Mars' is -- I'm arguing about what you and I _KNOW_. We don't KNOW that red point is planet -- we've simply been taught, and believe it. For the record, I believe Mars is a planet, despite having no personal experience or evidence whatsoever.
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