I just looked it up, and apparently there are rules as to what you can call a planet! They are:
• it should be 16 characters or less in length;
• it should be one word if possible;
• it should be pronounceable (in some language);
• it should be non-offensive;
• it should not be too similar to an existing name of an astronomical object.
• it should not be the name of pet animals;
• it should not be of a purely or principally commercial nature;
• it should not the names of an individual, places or event known for political, military or religious activity;
• it should not be the names of a living individual.
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