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Neutron star material, if it could be contained by means other than its own gravity; would require a cube about 390 meters on a side to equal the mass of the Earth, if it could somehow be 'placed' ...
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Neutron star material, if it could be contained by means other than its own gravity; would require a cube about 390 meters on a side to equal the mass of the Earth, if it could somehow be 'placed' ...