The gravitational force between Pluto and Charon is 3 point 6 1 times 10 to the 18th power cap n Pluto has a mass of 1 point 3 times 10 to the 22th power kilograms , which is only slightly greater than Charon’s mass of 1 point 6 times 10 to the 21th power kilograms How far apart are Pluto and Charon?