Assertion: moon's mass | /r/CapableOf | allow calculation of its density
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text: Charon's volume and mass allow calculation of its density, 1.702±0.017 g/cm3, from which it can be determined that Charon is slightly less dense than Pluto and suggesting a composition of 55% rock to 45% ice (± 5%), whereas Pluto is about 70% rock.