# Does earth's size affect the temperature of the poles?

What effect does Earth's size have on the temperature of the north and south poles? If the Earth were larger, or smaller, would this affect those temperatures?

• Internal heating: the heat generated by radioactive decay is proportional to the amount of radioactive material, i.e. the volume of the Earth (proportional to its radius $R$ cubed, $\sim R^3$), assuming a fixed density and composition. The heat loss is proportional to the surface area ($\sim R^2$). So the larger the planet, the higher the temperature increase coming from internal heating.