Paul I am sure you understand that in science the onus is on the claimant to back their arguments up. That includes citing references and not asking others to find papers by searching. A near imposible task without at least a year and Author of a paper. Please provide the Author, year and preferably volume (assuming Nature) of publication of this paper you keep referring to. The one with the supernova below the chandrasekhar limit. There is no way Nature is going to do a paper search for me. I can not longer afford a subscription, I threw my back issues out a long time ago to make way for children.