sun's core
- fusionJoining into unity
- hydrogenSimplest atomic element
- heliumLightest noble gas
- plasmaElectrified matter state
- nuclearOf atomic energy
heat · energy · pressure · burning · radiative · convection · million · degrees · thermonuclear · dense · gravity · protons · reactions · intense · stellar · interior · furnace · blazing
sun's coredead star
intergalactic space · empty space · heat death · black dwarf