I've recently listened to one of isaac arthurs podcast and now I'm wondering could a civilization actually survive inside a star? In short in our star? No surface tempratures are 5700°K and the gravity at the relative surface would be 27,94G Now let's say proxima centauri (the closest star except our sun and a whole lot smaller)? (info) The surface temprature is only 3042°K this is warm but but theirs a great many materials that can actually survive these temprature. (source) most promising are thungsten and carbon. There is actually quit a list but many are either radioactive or extremly rare. That said the myth that if you would trow something inside a sun and it would yust vaporize is not absolute. Gravity whilst our sun would provide 27,95G of gravity a 50kg person would weight 1397,5 kg (a 100kg person would weight 2795kg) the relative surface gravity from proxima centauri would be 0,052 m/s² meaning a 50kg person would weight 0,26kg a 100kg person would weight 0,53kg. So okay you could build it and it would last and you could pravticly float in it. But the interior would eventually equalize with the exterior making it 3000°K inside (you cook) looking at the thermal propperties for tungsten it's around 173 W/(m·K) for comparison iron80.4 W/(m·K), copper 401 W/(m·K) and aerogel 25 mW/(m·K). But even if it was 0 you would evcentually cook because of people also radiate heat. That said you could make poles (space elevators) that end in a solar sail the sail would mean that you aren't bound to orbital speeds meaning the elevators could be much shorter and the other shadow side could be used to radiate the internal heat away. So if not impossible what would you do there why make the effort. Basicly you have a near infinite amount of heat (energy) and mass that could be used to make heavier elements. Basicly you can do the things that stars do and turn lighter elements in whatever you need both on the periodic table and anti matter. Do you think this would be plausible or do you think theirs easier ways to get near infinite mass.