ELi5 what makes the sun a star and not a planet? And why is the moon not considered a planet?

Question

ELi5 what makes the sun a star and not a planet? And why is the moon not considered a planet?

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Answer 1

We consider the Sun a star and not a planet because it is big enough to sustain nuclear fusion. And we do not consider the Moon a planet because it orbits another planet instead of orbiting a star.