What density analogy is used to describe the extreme compression characteristic of neutron star material?
Answer
Compressing the entire mass of the Earth down to the size of a sugar cube.
Neutron stars represent matter under arguably the most extreme stable conditions achievable via stellar evolution, leading to phenomenal densities. To illustrate this level of compression, an analogy is drawn relating to our own planet. If one were to take all the mass contained within the entire Earth and shrink it down spatially until it occupied only the volume of a single sugar cube, the resulting density would approach the incredible densities characteristic of the matter making up a neutron star.
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