Charon – the largest moon of the dwarf planet Pluto – may once have had a warm subterranean ocean, suggests a team of planetary scientists led by Dr Alyssa Rhoden of NASA’s Goddard Space Flight Center. This artist’s impression shows the surface of Pluton, Charon and the Sun. Image credit: ESO / L. Calçada. Discovered in June 1978 by United States Naval Observatory astronomer James Christy, Charon is the largest of Pluto’s five...
