Quote Watsisname (

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I'm not sure how well it fares during the sun's giant phases
I created a red giant Solar system in Celestia one time (I think I may have done it in SE too), and Europa was something like 1000K. Even Pluto was too hot. I recall that only Eris was a reasonable temperature. I should note that I created this to simulate the most luminous period of the red giant phase.