When will the sun explode?
The Sun will never explode, because it lacks the mass to explode as a core-collapse supernova, nor is it a member of a close binary star system where one star is a white dwarf being fed material from the other star. Novae outbursts and type 1A supernovae are the result of hydrogen gas flowing from a star to a white dwarf companion. That is not to say the Sun will not ultimately destroy the Earth in the distant future, because it is inexorably expanding and brightening as it uses up the supply of hydrogen in the core. When the hydrogen is finally exhausted and the Sun begins to expand into a red giant, all life in Earth will be long gone and the Earth itself will be an inferno just like Venus is today after the increasing heat creates a mega-greenhouse effect that boils away the oceans. When it becomes a red giant, it will then boil away the atmosphere and turn the surface into an ocean of lava. The Sun will then lose it’s outer layers and die off as a white dwarf, but at no time will i
