The fusion level from the core is in a very self-correcting equilibrium: a slightly increased fee of fusion would cause the Main to warmth up much more and broaden slightly from the weight on the outer layers, reducing the density and that's why the fusion price and correcting the perturbation; http://digitaledemonen.nl/de-ultieme-gids-voor-het-kiezen-van-de-juiste-opstalverzekering-voor-uw-eigendom/