The interpretation of seismic and magnetic field observations used to probe the deep interior of terrestrial bodies such as the Earth or the Moon requires understanding the physical and chemical properties of metallic cores. This necessary knowledge comes essentially from high-pressure experimental studies and ab initio calculations on core analogs in the solid and the liquid states as well as from thermal modeling of the deep interior. In particular, density, when combined with seismic velocities of iron alloys as presented by Morard et al. (this issue), can be used to place constraints on core chemistry, elastic constants, as well as...

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