An impeller (also written as impellor or impellar) is a rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid. An impeller for a dam turbine generator.
The smallest planet in the Solar System is Mercury (the biggest planet is Jupiter). For the longest time, the smallest planet was considered to be Pluto, but now Pluto isnât a planet any more, so weâre back to Mercury.Mercury measures 4879 km along its equator.Just for comparison, Earth is 12,742 km across.So Mercury is only 38% the diameter of Earth.or the longest time, the smallest planet was considered to be Pluto, but now Pluto isnât a planet any more, so weâre back to Mercury. Mercury measures 4879 km along its equator. Just for comparison, Earth is 12,742 km across.
Alan Bustany, Trinity Wrangler, Amateur Astronomer, Planetary Enthusiast. A planet can be smaller than its own moon - if the planet is considerably denser than the moon. It should have a greater mass, of course. There is no such planet/moon in our SS. Up to date no exomoon is discovered, so we don't know if such planets/moons exist. Such systems should be rare.