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This is quite a difficult (and ambiguous) question to answer.

Let's start with the example of dwarf planet Pluto, approximately 1/5 the size of Earth. It is obviously not a planet because it is too small (as stated by its category, "dwarf planet"). We all know that it used to be a planet but was excluded due to its size.

We can therefore conclude that Mars, about 2/3 the size of Earth, is an existing planet simply because it met the size requirements; and the fact that it is neither a moon belonging to another planet (which can be distinguished by its orbit*), nor a star (distinguished by criteria of a star that it doesn't meet**).

* A planet orbits the Sun, but a moon orbits the planet it belongs to.

** Stars do not orbit, but Mars does. Also, stars have a special life cycle that Mars does not follow. And as well as this, Mars does not twinkle, blow up or behave like a star.

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14y ago

What else can I help you with?