Im guessing no one has gotten close enough to the sun to check. So how do they know for sure?
In: Physics
Because we know the Sun is mostly made of hydrogen. We also know that there isn’t that much oxygen so that the hydrogen and oxygen would burn like here on earth. We also know that the Sun produce way too much energy to be a chemical reaction. We know how much pressure and temperature hydrogen need to achieve fusion and those work with the temperature and mass of the Sun. We can model the entire life of a star like the Sun and we can see the different stage in a lot of stars in the universe.
Sure maybe that inside the Sun there is a machine that produce the exact same temperature, mass and electromagnetic spectrum as an hydrogen star in fusion, but that seem a bit far fetch. If it look like a duck, quack like a duck, it’s probably a duck.
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