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As objects get smaller, the ratio of surface area (heat loss to space) to volume (heat retained) gets larger. It is easier for the Moon to lose heat to space. Next, the Moon has no atmosphere to act as a blanket to prevent heat loss to space. Finally, the Moon is formed of lighter materials than the Earth proper, perhaps lighter materials from Earth. This means Earth's core has more heavy elements, that appear to actually be radioactive, heating the Earth's core.

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16y ago

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