The “equilibrium†in hydrostatic equilibruim can be understoodby imagining what would happen if we could somehow squeeze the Sun(add an outer layer to increase mass). Choose the correct sequenceof events if we could right now add mass to the Sun: a) The corewould heat up, leading to higher nuclear reaction rates, highercore pressures, and expansion of the core. b) The Sun would shrinkto become a brown dwarf, with higher nuclear reations rates andlower surface temperature. c) The carbon inside the Sun wouldignite, leading to rapid collapse of the core and then a supernovaexplosion. d) The dust inside the Sun would start appearing at theSun’s surface, preventing light from escaping to create a muchlarger hotter version of the Sun. e) The size and temperature andnuclear reaction rates in the Sun would stay exactly the same.
