originally posted in:Secrets of Destiny
Ah ha! You are the first person to bring up the shard, well done :D
Notice on the above image how there is a white layer and a gray layer of overlapping bands. The shard is likely a piece of the white layer. So I guess I'm a bit incorrect in my OP when I say I'm talking about the outermost layer, when I actually mean both the gray overlapping area and the white coating are 1km combined.
Edit: I updated the OP to be more specific, thanks mate!
English
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Also according to Wikipedia the mass of neutronium is only 4x10^17/m3 and based on what the article states about its half life i'd be using it as an energy core rather than a mantle otherwise the whole earth would be a radioactive ball of molten rock. The electroweak material doesn't really make sense unless it refers to the healing process? Or the method by which the traveller creates life ( I only say this due to the lack of knowledge about electroweak materials) The lead is more likely the mantle material this is based on the colour ( lead oxide) and its radiation protection, necessary for space fairing organisms Just my theory feel free to correct anything :)
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I went for the greatest density to be found at the center of a neutron star, that other number is probably an average of neutronium densities, and the traveler is so cool I bet he's only settle for the densest stuff B) Also, I think I agree with your lead oxide idea, though we know the traveler already has shielding that could keep any cargo free from dangerous radiation.