to wet1, Perhaps you're right. We're certainly still here. If a planet core's positional stability is perturbed enough [asteorid or moon collision], all kinds of things can go wrong. Obviously, if the center is a fission reactor, it makes sense to say that it could explode if hit with sufficient force. Right now it does not seem any gigantic asteorid with high speed can hurtle in to destroy Earth. What is being discussed in this paper, however, is about our environmenntal pollution and one of it's possible aftereffects, not in terms of being hit by any outside object. This is why such an idea is harder to believe, I think. On the internal heat, appendix 4 supposedly explains that boundary requirement, beyond which overheating may begin to take place. In the paper it is mentioned that heat is generated in the entire volume of the planet, and cooling can only occur at the surface, and the atmosphere holds heat in balance for the entire earth [not forgetting solar heat of course, the majority of heat that reaches the surface], not only the surface. The only other asteroid belt i can think of, and this is without really thinking about it, is the ring around saturn -- maybe that ring of rocks used to be a moon. Also Uranus and possibly also Neptune, have a ring. I guess the rings depend on how big, if they're composed of rocks, if they once were moons, how far away, gravity, atmosphere, etc. Maybe 'Phaethon' broke apart, exploding in the process, having been hit by an outside body. The story goes in ancient Greece, that the cataclysm was 'as bright as lightning', meaning either that the author of this paper's conclusions on this are incorrect, or Plato may be saying something important. See below [check the sourcing of this in the paper's works cited section] anyone read greek? : "Now this has the form of a myth, but really signifies decline of the bodies moving in the heavens . . . " -Plato, from Timmaeus, The Dialogues of Plato, The Great Books volume 7, encyclopedia brittanica, 1975 -- and from Demetriov, D., 'Neon Orthographikon,' Chr. Giobane, 1970. Wonder about radiation coming from the asteroid belt, what is found there. I have read there is some type of radiation there. The very idea of it having possibly been a planet, is to many scientists, sacrelige. However, it continues orbiting in a regular fashion, and total size adds up, more or less by not too much, to a planet-sized body/mass. I can therefore at the face of it, see how it may very well be a planet's remains. The author [[research team]] used 3-d integration, partial derivation, as a means of most calculations, as opposed to use of the archimedes principle of linear relationships for pressure, because he [and his team] puts forth a non-linear relationship. The work itself seems reasonable, it is the warning seems to be too much. He has done other work through scientific engineering research, p/l. Do a search for that organization on the internet, if not already done. I admit the idea on the surface is graphic unlike any presently accepted climate change projection or geophysics disaster prediction out there so far, and thus likely to be seen as at least impossible. http://www.technologyreview.com/offthewire/3001_662002_6.asp "Giant Nuke May Run Earth's Magnetic Field" United Press International PHIL BERARDELLI, UPI Deputy Science and Technology Editor 06/06/2002 Jun 05, 2002 (United Press International via COMTEX) -- Thousands of miles beneath our feet, a giant nuclear reactor seems to be at work deep within Earth's core, and preliminary research suggests it may be the mysterious power source behind the planet's magnetic field and thermal energy, upon which all life on the planet depends for its survival, scientists told United Press International.