Assertion: terrestrial planet's core | /r/CapableOf | provide the extra
Facets:
Source sentences:
text: So when a calculation of the structure of a planet such as the Earth, based on a strictly rocky structure (as discussed above) gives a density which is too low to explain the overall density of the planet, the solution to the problem must be that the core, consisting primarily of much denser nickel-iron mixtures/crystals, must provide the extra mass required.