The impeller made out of cast material in many cases may be called rotor, also. It is cheaper to cast the radial impeller right in the support it is fitted on, which is put in motion by the gearbox from an electric motor, combustion engine or by steam driven turbine.
Earth remains the only known planet to host life, due to a unique combination of factors. However, continued monitoring of alien worlds might one day change that, by finding other planets that share these attributes or by discovering other ways that life has found to blossom in the universe.
Based on this we would expect the Earth, as the largest of the Terrestrial planets, to have the highest internal temperatures. Venus, with a slightly smaller mass and size, should have comparable temperatures.But Mars and Mercury, being much smaller, should be considerably cooler than either the Earth or Venus.ased on this we would expect the Earth, as the largest of the Terrestrial planets, to have the highest internal temperatures. Venus, with a slightly smaller mass and size, should have comparable temperatures.