Pluto, as seen by the Hubble Space Telescope.
Pluto is the second largest dwarf planet in the Solar System, after Eris. It has a diameter of 1,466 miles, less than the moon.
Clyde Tombaugh and his telescope
Pluto is the second dwarf planet from the sun. The dwarf planet, which was discovered in 1930 by Clyde Tombaugh, was considered the ninth planet until 2006. The planet was reclassified because failed to meet the International Astronomical Union's third requirement to qualify as a planet: clearing its own orbit. Its orbit crosses with Neptune, bringing Pluto closer to the sun. This is why Pluto failed to defend its planetary position. The dwarf planet takes 248 years to orbit the sun. There is no clear picture of Pluto. So, the New Horizons spacecraft will visit Pluto in 2015.
Pluto has at least five moons. These include Charon, which is actually in a double planet system with Pluto, Nix and Hydra, which were discovered in 2005, and two unnamed moons, S/2011 1 and S/2012 1, which were discovered in 2011 and 2012, respectively.