yuyw

Sorry, I misread "billion" in the sentence as "million". Here I think you are right according to current theory of the evolution of stars. However, in my opinion it is unnecessary to worry about the future after 1 billion years, which is too long for us. To say the least, our knowledge up to today is so limited comparing with the abstruse universe.

I'm puzzled by your assertion "In 1 billion years, the sun will get hotter by ten percent". How do you obtained this conclusion? Can you give me more detailed evidences? Thank you!