The temperature on Pluto is quite cold and ranges from -387 to -369 degrees Fahrenheit. Just like all other planets, the temperature on Pluto changes according to seasons or distance from the sun as it moves in its orbit... More » Science Astronomy Planets

Pluto has an average radius of 715 miles. The planetary body is 20 percent smaller than Earth and it has a diameter of 1,430 miles. More » Science Astronomy Planets

Pluto became a dwarf planet in 2006. Upon being stripped of its title as a planet, Pluto joined two other celestial bodies, called Eris and Ceres, in the category of dwarf planets. The decision to reclassify the former p... More »

Although no one knows exactly what Pluto is made of, most scientists agree that it is between 50 and 70 percent rock, with the remainder being composed of various ices. Pluto’s core is composed of dense rock, while the i... More »

The planet Pluto is named after Pluto, the god of the underworld in Greek and Roman mythology. The name was suggested by a young girl, Venetia Burney Phair, in 1930 when she heard the news that a new planet had been disc... More »

In 2006, the International Astronomical Union redefined the criteria for what qualifies as a planet, causing Pluto to lose its designation as such. As of 2014, Pluto is considered one of five dwarf planets, with the othe... More »

Pluto has a volume of about 1.53 cubic miles, a radius of 715.2 miles, a surface area of 6.42 million miles and an equatorial circumference of 4,493.7 miles. It is only 0.006 times as voluminous as Earth. More » Science Astronomy Planets