Pluto might have hogged much of the spotlight historically, but the dwarf planet is actually part of a double act, alongside its biggest satellite, Charon. A new analysis suggests that Pluto used ...

A new theory about Pluto’s largest moon, Charon, could alter how planetary systems are taught in U.S. schools. Scientists suggest that 4.5 billion years ago, Pluto and Charon experienced a "kiss ...