Pluto takes nearly 248 years to complete an orbit, so we haven't yet sent out any notifications for Plutonian Birthdays.

Recently back in the news following the astonishing images and data sent back by the New Horizons space probe, we are beginning to learn a whole wealth of new information about this fascinating dwarf planet.

Pluto has five known moons: Charon (the largest, with a diameter just over half that of Pluto), Styx, Nix, Kerberos, and Hydra. Pluto and Charon are sometimes considered a binary system because the barycenter of their orbits does not lie within either body.