Ultimately, all the original gases in the star burn to Iron 56 which is the most stable nucleus. The star is then very hot and very small and often becomes a white dwarf. Its temperature is 80,000 Kelvin. The solar corona is always evaporating into space creating the solar wind. The solar wind flows past the Earth and even beyond Pluto.
Auroras are the visual effects of the solar wind interacting with a planet's upper atmosphere.
The corona that evaporates is replaced so that an entirely new corona is formed about once a year. Although the Sun's interior can be safely observed by analyzing neutrinos which escape easily from the Sun and using helioseismology techniques, it is extremely important to never look directly at the Sun without protective eyewear.