IIRC, one the strongest objections to the then new science of Geology and its claims that the Earth is millions, if not billions, of years old was that no-one could explain how the sun could provide heat and light for such a long time using the fuels of the time.
The discovery of nuclear fusion cleared that one up, and RET now says that
- the sun is 150,000,000km away and 1,400,000km in diameter;
- the "atmospheric pressure" at the centre is high enough to start a fusion reaction of hydrogen into helium;
- The reaction runs at a temperature of 15,000,000K and releases 400,000,000,000,000,000,000,000,000 watts of energy.
FET says the sun is 4,800km away and 50km in diameter. Can anyone explain the rest rationally and possibly cogently?