Whereas a moon usually orbits a planet, both Pluto and Charon orbit a point in space between them — their common center of mass. The other four moons in the system — Styx, Nix, Kerberos and ...

In the play, an old Housman dreams that he is dead. As Charon, the mythical boatman, ferries him across the River Styx, Housman returns to the Oxford of his youth where he fell in love with ...

This slow collision would have caused a "geologic reset" for Pluto, as Charon stripped some of its ice, and potentially led to the formation of Pluto's smaller moons — Nix, Styx, Kerberos ...

The findings, published earlier this month in the journal Nature Geoscience, challenge the widely accepted notion that Pluto and Charon formed the same way the Earth and moon did, with a ...