The other four moons in the system — Styx, Nix ... Pluto and Charon are tidally locked to each other, meaning they always show the same face to each other, and they orbit their common center ...

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 ...