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No... it's a planet. A star is an extremely hot ball of gas. Basic astronomy?
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Vader says "Hoth system, 6th (unnamed) planet". Systems aren't named after planets. Not that it really matters, it's fictional and I get the idea of what you meant.
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If hoth was a star: A: they'd be crushed by the extreme gravitational pull of it B: they'd be standing on a recurring nuclear reaction which is not healthy.
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