Presumably civilization will be using iron stars by then? https://en.wikipedia.org/wiki/Iron_star#Compact_iron_star_formation https://en.wikipedia.org/wiki/Iro

Presumably civilization will be using iron stars by then? https://en.wikipedia.org/wiki/Iron_star#Compact_iron_star_formation https://en.wikipedia.org/wiki/Iron_star#Compact_iron_star_fo... ...although I'm not sure I've ever seen the expected temperature of iron stars. 1 milliKelvin?