Sol is gas, right?
Gasses cool when they expand, right?
What’s the expected surface temperature of Sol after it has expanded past Earth’s orbit?
Gasses cool when they expand, right?
What’s the expected surface temperature of Sol after it has expanded past Earth’s orbit?
On the one hand, artists’ conceptions of boiled oceans and cities in cinders that saddened and discouraged me in my childhood. On the other hand, the heat energy density of Sol today is comparable to a compost heap. When the radius of a sphere doubles, it’s volume increase eight times.
If Sol is too itsy to start helium fusion, maybe orbiting within the post-expansion photosphere - the hydrogen envelope - is chill, damp, and sparky?