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:''For the lunar crater, see Cassini (lunar crater). For other things named Cassini, see Cassini (disambiguation).'' Cassini is a crater on Mars named in honour of the Italian astronomer Giovanni Cassini. The crater is approximately 415 km in diameter and can be found at 327.9°W and 23.8°N.〔http://ic.arc.nasa.gov/projects/bayes-group/Atlas/Mars/features/crater/index.html〕 It is in the Arabia quadrangle of Mars. Pictures of small craters on the floor of Cassini reveal multiple layers. Some of these layers can be easily seen in the pictures below. Many places on Mars show rocks arranged in layers. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers. A detailed discussion of layering with many Martian examples can be found in Sedimentary Geology of Mars.〔Grotzinger, J. and R. Milliken (eds.). 2012. Sedimentary Geology of Mars. SEPM.〕 Recent research leads scientists to believe that some of the craters in Arabia may have held huge lakes. Cassini Crater probably once was full of water since its rim seems to have been breached by the waters. Both inflow and outflow channels have been observed on its rim. The lake would have contained more water than Earth's Lake Baikal, our largest freshwater lake by volume.〔Fassett, C. and J. Head III. 2008. Valley network-fed, open-basin lakes on Mars: Distribution and implications for Noachian surface and subsurface hydrology. Icarus: 198. 39-56.〕 Many craters once contained lakes.〔Cabrol, N. and E. Grin. 2001. The Evolution of Lacustrine Environments on Mars: Is Mars Only Hydrologically Dormant? Icarus: 149, 291-328.〕〔Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Distribution and implications for Noachian surface and subsurface hydrology. Icarus: 198, 37-56.〕〔Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Implications of valley network lakes for the nature of Noachian hydrology.〕 Image:Arabia map.JPG|Map of Arabia quadrangle with major craters. Cassini is in the upper right. Image:Cassini crater floor.JPG|Crater in the middle of Cassini crater, as seen by HiRISE. WikicassinilayersESP 028919 2030.jpg|Layers in a crater on the floor of Cassini Crater, as seen by HiRISE, under HiWish program == See also == * Planetary nomenclature * Impact crater * Water on Mars * Climate of Mars * List of craters on Mars 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「Cassini (Martian crater)」の詳細全文を読む スポンサード リンク
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