According to flat-earthers planets don't even exist and are merely a fabrication brought up by "so-called" astronomers. Cut short they already answered that question. Only the moon (which is technically not a planet) is recognized, but not as an actual mini-planet circling about another planet (which the moon technically is), but as a giant gas bubble. Needless to say the flat-earthers therefore also deem the moon-landing a hoax.
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