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Cthulhu Regio
Cthulhu Regio 〔Also 〕 is a prominent surface feature of the dwarf planet Pluto, that is reminiscent of a whale in shape. It is an elongated dark region along Pluto's equator, long and one of the darkest features on Pluto. It is west of the Sputnik Planum region of Tombaugh Regio, also known as Pluto's "heart", and to the east of Meng-P'o, the easternmost of Pluto's "Brass Knuckles".
==Description==
The dark color of the region is speculated to be the result of a "tar" made of complex hydrocarbons called tholins covering the surface, which form from methane and nitrogen in the atmosphere interacting with ultraviolet light and cosmic rays. Tholins have been observed on other planetary bodies, such as Iapetus, Umbriel, and in the atmosphere of Titan, although the irregular and disconnected nature of the dark spots on Pluto has not yet been explained.〔 The presence of craters within Cthulhu indicates that it is perhaps billions of years old, in contrast to the adjacent bright, craterless Sputnik Planum, which may be as little as 100 million years old. Higher-resolution images of the border between the two regions indicate that lighter material from Sputnik Planum, composed of nitrogen, carbon monoxide, and methane ices, may be invading and overlaying the easternmost part of the dark Cthulhu Regio. As of 30 July 2015, the eastern "head" region had been imaged in much higher resolution than the western "tail" region.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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