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Physics, Astronomy & Cosmology / Re: Can a star powered by nuclear fission be created?
« on: 02/08/2013 03:34:59 »
To some extent, you have answered the underlying question already! Some water-moderated fission reactors (I think CANDU was one such system) are inherently stable as any temperature rise reduces the efficiency of the moderator, so reducing the thermal neutron flux. You can set the operating temperature by design. Not a star in the conventional sense, but a source of heat and ionising radiation nevertheless. What more could one ask for?