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.
Pyle. 1  If any of the planet-ending tropes of sci-fi come to pass in real life, we could now have a place to point our not-yet-real starships toward. NASA announced on Thursday that it has found the first near-Earth-size planet orbiting in the habitable zone of a star that is similar to our own sun. Scientists don't yet know for sure if the planet spotted by the Kepler space telescope, dubbed Kepler-452b, can support life.