也是冥王星唯一的卫星的名字。
It 's also the name of pluto 's only moon .
冥王星的卡伦卫星的体积是冥王星的一半；而万斯卫星的体积则是奥库斯星的1/3。
Pluto 's moon Charon is half the size of Pluto , and Vanth has been estimated to be one-third the size of Orcus .
冥王星卫星