Pluto has been demoted from the status of a planet after similar planets were discovered in its vicinity. Now it is a dwarf planet. But it still behaves like a planet. Though its smaller than our Moon, it has 5 moons circling around it.
Pluto was discovered in 1930. But its largest moon Charon was not discovered until 1978. That is because at such a great distance, the two tiny objects appeared blurred together to the telescopes of earlier days. Pluto and Charon are considered a "double planet", because Charon is half the size of Pluto.
Here goes a list of all five moons of Pluto.
Charon
Discovered: 1978
Diameter: 648 miles
Hydra
Time of discovery: 2005
Diameter: 20-70 miles
Nix
Time of discovery: 2005
Diameter: 20-70 miles
P4
Time of discovery: June 28, 2011
Diameter: 8-21 miles
P5
Time of discovery: July 7, 2012
Diameter: 6-15 miles
Orbit around Pluto: 58,000 miles
Sources:
"Hubble Discovers a Fifth Moon Orbiting Pluto", 7 Jul 2012, http://solarsystem.nasa.gov/multimedia/display.cfm?Category=Planets&IM_ID=13923
"Another Moon For Pluto", 28 June 2011, http://solarsystem.nasa.gov/multimedia/display.cfm?Category=Planets&IM_ID=12443