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 »

www.reference.com 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 »

www.reference.com 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 »

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 »

Pluto is 4.67 billion miles away from Earth. At a certain condition, the two celestial bodies are only 2.66 billion miles apart. NASA sent the New Horizons spacecraft on a mission to visit Pluto, and it is expected to re... More »

www.reference.com Science Astronomy Planets

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 »

When Pluto has an atmosphere, it is thought to be made up of methane, nitrogen and carbon monoxide in gaseous form. This atmosphere outgases from the ice on Pluto's surface when it is closest to the sun, which warms the ... More »