Pluto: Planet 9

	Diameter	1,485 miles (2,390 km)
	Average Distance from Sun	3,647,200,000 miles (5,870,000,000 km)
	Planet Composition	rock and ice
	Atmosphere	virtually none
	Surface Temperature	-375°F (-225°C)
	Number of Moons	1
	Orbital Period	90,588 (248 years)
	Period of Rotation	6 days 9 hours retrograde

Pluto is the smallest planet in the solar system, and is usually the farthest from the Sun. It is about 39 times farther from the Sun than the Earth is!

Pluto has a lopsided orbit with large eccentricity. Occasionally Pluto travels inside Neptune's orbit, and is the 8th planet from the Sun.

Pluto is the only planet in our solar system that has not been visited by a spacecraft. Even the best photographs taken by the Hubble Space Telescope are fuzzy with few details, like the one above. We know very little about this distant planet, and scientists are only guessing about its composition and atmosphere.

In Pluto's low gravity, a 100 pound person would weigh only 7 pounds.

The moon Charon is half Pluto's diameter, so Pluto and Charon are sometimes called a double planet.

Some astronomers do not consider Pluto a planet due to its small size, lack of atmosphere, unusual orbit, and large moon.

Pluto and Charon