In fact: The burning of the sun is not a chemical combustion, it is a nuclear fusion. The sun is considered as the giant hydrogen bomb. In the nuclear fusion, the nuclei of the atoms fused with each other to form a larger nuclei. The nuclear fusion does not involve oxygen
West Texas A&M University
“The sun does not run out of oxygen for the simple fact that it does not use oxygen to burn. The burning of the sun is not chemical combustion. It is nuclear fusion. Don’t think of the sun as a giant campfire. It is more like a giant hydrogen bomb.“
IFL Science
“The Sun is 91 percent hydrogen and 8.9 percent helium in terms of its number of atoms, and around 70.6 percent hydrogen and 27.4 percent helium by mass. If you do the math real quick, you’ll notice that doesn’t leave a lot of room for oxygen to be present, let alone enough to sustain fire. Instead, heat and light are generated by nuclear fusion.”
My Modern Met
“In a fusion reaction, two light nuclei merge to form a single heavier nucleus. The process releases energy because the total mass of the resulting single nucleus is less than the mass of the two original nuclei. The leftover mass becomes energy. This energy travels as radiation to Earth, where it acts upon atoms in our own atmosphere to create heat. That’s how the Sun “burns” in the oxygen-deprived realm of space.”
Space
“The temperature at the core of the sun is about 15,600,000 degrees on the Kelvin temperature scale. The sun is 4.5 billion years old and has used up about one half of its hydrogen fuel supply.”
flerf.org 