The concern is not necessarily that New Horizons, which launched in 2006, will slam into a Pluto moon that has thus far eluded detection.

MSN: New Pluto moon hints at perilous journey for spacecraft

Sometimes they need a little help from something like the Hubble Space Telescope, but its our peepers that ultimately spotted Pluto's fifth moon, P5.

ENGADGET: Alt-week 7.28.12: social mathematics, Pluto's moons and humans-on-a-chip

Charon, Pluto's largest moon, is named after the ferryman who carried the souls of the newly deceased across the River Styx, which divided the world of the living from that of the dead.

MSN: Hell of a Choice: Cerberus Leads for New Pluto Moon Name