“as hot as a sun” is a rather broad term. Is it hot as its surface (i.e. few thousand of degrees celsius)? Or is it as hot as a stellar core (within tens of millions of degrees)?
Either way, you can have that temperature happen for a very brief moment, you can have the stuff isolated in a vacuum/magnetic confinement, you can have an active cooling system that will keep the walls from melting down. And probably a few other ways/combinations of them that I might not be aware of right now.
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