Erm, I'm a lapsed physics graduate. Thanks for the correction, I was also watching PBS Space Time on Red Dwarfs, and how small stars cool the core by convectio

Erm, I'm a lapsed physics graduate. Thanks for the correction, I was also watching PBS Space Time on Red Dwarfs, and how small stars cool the core by convection. Larger stars use radiation in the core and so lose access to a majority of the mass of the star which could have been used for fuel.