How does the sun burns when there is no oxygen in space?
Although there is some oxygen in the Sun, the heat and pressure are too high for molecules to form as in oxidation (burning) here on Earth. The energy of the Sun comes from nuclear fusion in which hydrogen atoms combine to form helium and in the process release a tremendous amount of energy. Oddly, there is not enough pressure in the Sun to cause the fusion directly. If there were, most of the fusion would occur fairly rapidly as it does in more massive stars, instead of over the billions of years of our Sun’s “main sequence”. The fusion in the Sun occurs because of a rare effect called “quantum tunneling”. Using quantum tunneling, fusion takes several separate steps to form helium and release energy. During the process of making a helium atom, about 0.7% of the original hydrogen is converted from matter to energy. In the Sun, even though quantum tunneling occurs extremely rarely to atoms, there are so many atoms that more than four million metric tonnes of hydrogen is converted to ene
