Does a Star Before going Supernova Explosion became Red Gaint and swell ?
All stars will burn hydrogen into helium at the first stage of evolution. The heat produced at this stage is generally extremely hot. The more massive a star, the hotter is its core temperature. When most hydrogen is converted into helium, the star will switch into burning helium as its fuel. The energy and heat produced to burn helium is greater than when it was burning hydrogen. As you have known, heat pretty expands everything, even a star. The hotter core will now make the star expand or “swell” as you call it. However, this process is not efficient in burning helium, rather, the star will expand and contract as the fuel is burnt in layers inside a star. The process of burning fuel will continue until every element that can be burnt is “burnt” or “used up”. The heavier the element produced by nuclear fusion, the more heat is produced in the core, then again the more the star expands as a red supergiant. There will come a point when the core (the material in it) of the star can neve
