Amazing Space- Fast Facts: Dwarf planet, Pluto

Age	About the same age as the Sun: 4.5 billion years
Location	Solar system
Avg. distance from the Sun	5,914,000,000 km (3,674,000,000 miles)
Diameter	2340 km (1454 miles)
Mass	1.27 x 10²² kg
Orbital period around the Sun	247.7 Earth years (90,410 Earth days)
Number of moons	Three: Charon is Pluto's largest moon, discovered in 1978. In 2005, two smaller moons were discovered and later named Nix and Hydra.
Distinguishing features	Pluto was the smallest planet until August 2006, when the International Astronomical Union reclassified it as a dwarf planet. Its composition and atmosphere are unknown but it is likely composed of rock, ice, and frozen gases. Its atmosphere is mainly nitrogen with a little carbon monoxide and methane. Pluto’s orbit is more elliptical and more inclined than the orbits of the eight solar system planets. The icy dwarf planet is not massive enough to clear debris from its orbit, a key reason why it is not a planet.