Because the sun doesn't have an ice core. Seriously, you are far less intelligent than I thought (didn't think that'd be possible) if you seriously think that is evidence for a flat earth. Oh, and as always, please have yourself sterilised.
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But the sun IS made of billions of super heated particles (according to spgerists) so why doesn't it have a tail? Or other stars for that matter?
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Because it's not venting steam like a comet is. You know comets only have a tail when they're near a star right?