| 翻訳と辞書 |
| Geology of Pluto ： ウィキペディア英語版 |
Geology of Pluto
The geology of Pluto consists of the characteristics of the surface, crust, and interior of Pluto. Because of Pluto's distance from Earth, in-depth study from Earth is difficult. Because of this, many details about Pluto remained unknown until 14 July 2015 and onwards, when ''New Horizons'' flew through the Pluto system.〔 When it did, Pluto was found to have a lot of geologic diversity, with ''New Horizons'' team member Jeff Moore saying that it "is every bit as complex as that of Mars” 〔http://astronomy.com/news/year-of-pluto/2015/09/new-pluto-images-from-nasas-new-horizons-show-complex-terrain〕
== Surface ==
Pluto's surface is composed of more than 98 percent nitrogen ice, with traces of methane and carbon monoxide.〔 The face of Pluto oriented toward Charon contains more methane ice, whereas the opposite face contains more nitrogen and carbon monoxide ice.〔
Maps produced from images taken by the Hubble Space Telescope (HST), together with Pluto's lightcurve and the periodic variations in its infrared spectra, indicate that Pluto's surface is very varied, with large differences in both brightness and color,〔 with albedos between 0.49 and 0.66.〔 Pluto is one of the most contrastive bodies in the Solar System, with as much contrast as Saturn's moon Iapetus.〔 The color varies between charcoal black, dark orange and white.〔 Pluto's color is more similar to that of Io with slightly more orange, significantly less red than Mars.〔 ''New Horizons'' found that Pluto's surface age is equally variable, with ancient, dark, mountainous terrain (such as Cthulhu) being found alongside the bright, flat, effectively craterless Sputnik Planum and various terrains of intermediate age and color.
Pluto's surface color has changed between 1994 and 2003: the northern polar region has brightened and the southern hemisphere has darkened.〔 Pluto's overall redness has also increased substantially between 2000 and 2002.〔 These rapid changes are probably related to seasonal condensation and sublimation of portions of Pluto's atmosphere, amplified by Pluto's extreme axial tilt and high orbital eccentricity.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Geology of Pluto」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|