Some studies say that if Pluto had been closer to the Sun, it would have been a comet. Being composed of rock and ice, it would not have last long in proximity of the Sun.
Pluto has three natural satellites of its own. Charon was discovered in 1978 while the other two satellites namely, Nix and Hydra were found in 2005. Pluto's moons are exceptionally close to it. Scientists say that the Plutonian system composed of Pluto and its satellites is very compact.
