> What? Why? News to me too. I found a site. The answer is longish but begins this way: A photon of light can take 100,000 years from the core of the Sun to g

> What? Why? News to me too. I found a site. The answer is longish but begins this way: A photon of light can take 100,000 years from the core of the Sun to get to the surface. the density of the core is incredibly high — 150 times greater than water. So all the atoms are jammed up against each other. Let's look at a pair of hydrogen atoms that have fused together to make a helium atom — and released a lot of energy, in the form of gamma rays. The gamma rays can travel only a few millimeters, before they're absorbed by an atom, and then re-radiated. Over and over again, they are absorbed, and then re-radiated. So, very slowly, the gamma-rays that have been generated by nuclear burning work their way up from the dense core. After thousands upon thousands of years, they make their way into what's called the 'radiative zone'. The radiative zone is huge — it stretches up from the outer core (that's at the 24 per cent mark) to about 70 per cent of the way to the surface. It's called the radiative zone, because here, energy travels by radiation. The gamma rays are still being absorbed and re-radiated, but each time they're being re-radiated at longer wavelengths. They gradually get converted from gamma rays down to visible light. ref: https://www.abc.net.au/science/articles/2012/04/24/3483573.htm https://www.abc.net.au/science/articles/2012/04/24/3483573.h...