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Message: <blockquote data-quote="Pbartender" data-source="post: 3199451" data-attributes="member: 7533">The same thing that happens to iron in a main sequence star...  not much.The iron will get very, very hot, and likely be ionized. Then it gets spit out the back with all the other exhaust.  Anything on the hydrogen side of iron will either get fused or spit out, depending on how hot the fusion reaction is.  Anything on the heavy side of iron will likely be spit out, but there's an outside chance it could split in a fission reaction.In other words, the farther you get away from hydrogen, the less efficient the fuel mix will be...  But go watch Back to the Future 2 again.  A good sci-fi fusion reactor can run on anything.</blockquote>