Planets in our solar system.
Pluto was once known as the ninth planet and most distant from our sun. It was discovered in 1930, and was downgraded to a "dwarf planet" in 2006. Pluto has a moon called Charon, which is the smaller dot in the top part of the picture.
Pluto is 5,906,380,000km from the Sun.
Its radius is 1,151km.