Posted: Jan 05, 2019 8:45 pm
I think we are talking about two different things here.
The energy density of a star in part could be analogous to how pressure (energy density) changes with depth in water, ~100 kPa with each 10 m.
I could be wrong, but I would surprised if the energy density changes significantly on a moment by moment basis in a star (our Sun), though at some point in a hopefully distant future all bets are off. I have read it takes hunderds of years for a photon to escape the core of our sun ... at least on average.
Having said I think Dyson is referring to quantum phenomena ... and this is definitely beyond my pay grade.
The energy density of a star in part could be analogous to how pressure (energy density) changes with depth in water, ~100 kPa with each 10 m.
I could be wrong, but I would surprised if the energy density changes significantly on a moment by moment basis in a star (our Sun), though at some point in a hopefully distant future all bets are off. I have read it takes hunderds of years for a photon to escape the core of our sun ... at least on average.
Having said I think Dyson is referring to quantum phenomena ... and this is definitely beyond my pay grade.