Pluto may not be a planet anymore, but it has more moons than the Earth does. Pluto’s 4th and 5th moons were discovered in 2011 and 2012. At that time, only three of Pluto’s moons had been named. Recently, the International Astronomical Union (IAU) chose two proper names for the previously dubbed P4 and P5. Those moons will henceforth be known as Kerberos and Styx, respectively.
Credit: NASA, ESA and M. Showalter (SETI Institute)
All four of the newer moons (Hydra, Nix, Kerberos and Styx) were discovered in images from the Hubble Space Telescope. They’re also all tiny. Charon, discovered in 1978, is the only one of Pluto’s moons that a person couldn’t easily circumnavigate on foot.
Here's an older pre-name change family picture:
This image, taken by NASA's Hubble Space Telescope, shows five moons orbiting the distant, icy dwarf planet Pluto. The green circle marks the newly discovered moon, designated P5, as photographed by Hubble's Wide Field Camera 3 on July 7.
Credit: NASA; ESA; M. Showalter, SETI Institute