Pluto's moon springs a watery surprise
Pluto's moon, Charon, has surprised astronomers with the discovery that it is covered in ice made of frozen water and possibly ammonia, raising intriguing questions as to the satellite's past.
Pluto's moon, Charon, has surprised astronomers with the discovery that it is covered in ice made of frozen water and possibly ammonia, raising intriguing questions as to the satellite's past.