5 ms·

Thanks for the link. I wonder what temperature prevails at 1.0 AU. On the one hand, artists’ conceptions of boiled oceans and cities in cinders that saddened a

Thanks for the link. I wonder what temperature prevails at 1.0 AU. 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?

rootusrootus 5y ago
The sun won't (potentially) swallow up the Earth for about 8 billion more years. The carbon cycle on this planet will have ended about 7 billion years before then; the increased output of the sun will have boiled away the oceans; plate tectonics will stop, etc. There won't be anything alive on this planet left to see the sun burn out.
- tlholaday 5y ago
  Sounds bad for surface life. Morlocks live underground.