‘ Pluto's surface has mountains, valleys, plains, and craters. The temperature on Pluto can be as cold as -375 to -400 degrees Fahrenheit (-226 to -240 degrees Celsius). Pluto's tallest mountains are 6,500 to 9,800 feet (2 to 3 kilometers) in height. The mountains are big blocks of water ice, sometimes with a coating of frozen gases like methane. Long troughs and valleys as long as 370 miles (600 kilometers) add to the interesting features of this faraway dwarf planet. Craters as large as 162 miles (260 kilometers) in diameter dot some of the landscape on Pluto, with some showing signs of erosion and filling. This suggests tectonic forces are slowly resurfacing Pluto. The most prominent plains observed on Pluto appear to be made of frozen nitrogen gas and show no craters. These plains do show structures suggesting convection (blobs of material circulating up and down). ‘-NASA
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