Neutron stars are some of the densest objects in the universe. They form during supernova explosions and are very small compared to other astronomical objects. You can assume 5 x 1017 kg/m3 as the average density of a neutron star. The Earth has a total mass of about 5.97 x 1024 kg. What would be the diameter of the Earth if it had the density of a neutron star?
"d=\\sqrt[3]{\\frac{6m}{\\pi d}}=0.28~km."
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