Earth, Pluto, Charon, and Earth's Moon compared. Pluto's diameter less than 20 percent that of the Earth's (smaller than the Earth's Moon) It has less than one percent the mass. If you weigh 180 pounds on Earth, you would weigh 11 pounds on Pluto. Pluto is 30 to 48 times further from the Sun than the Earth (Pluto's orbit is highly elliptical)