Im guessing no one has gotten close enough to the sun to check. So how do they know for sure?
In: Physics
Another point worth mentioning to some of the other comments is that the Sun is far too low density to be anything but a nuclear reaction.
the Sun is much more massive than the earth, but the earth is much denser than the Sun. The only way for the Sun to stop becoming much, much denser is if something is counteracting gravity.
the Sun is so massive that nothing but a very exothermic nuclear reaction could counter that much gravitational collapse. In fact, every single nuclear bomb ever made by humans, multiplied by a million, detonated every single second in the center of the Sun, would not be enough to stop the Sun from collapsing. There really is nothing else but a constant nuclear fusion of hydrogen that could explain the low density of the Sun.
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