Will the sun burn out due to expansion and will the earth slowly freeze to death?
The sun will burn out when it runs out of helium. The earth will die in a burning, not a freeze. It will be about 5 billion years till earth dies, and a bit more till it freezes. If you want the details and an explanation, I will expound on this below (if not, i’d stop reading now because you will probably be quite bored reading further if you don’t actually want the explanation): Stars are huge spheres of very hot hydrogen and helium gasses. The gasses in a star are held together by the large gravitational forces created by its own mass. Thermal pressure from the heat inside the star balances this gravity and prevents it from collapsing. The center of a star can reach temperatures of 15,000,000 K. The pressure at the center of a star is over 100 Billion times the atmospheric pressure on earth and the density is 7 times denser than gold. A star burns from nuclear fusion inside the core. Here hydrogen atoms fuse into helium releasing huge amounts of energy. This is the normal main seque
