In 1978 James Christy discovered the Pluto’s moon. He was examining images of Pluto to refine its orbit and noticed a bump on Pluto. It was named Charon. Once again estimates of Pluto’s size, and other characteristics, changed. It also turned out that Pluto and Charon revolved synchronously, or with the same face toward each other always. But noone has ever agreed on just how to pronounce Charon.