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Steno (Martian crater)
・ Steno Diabetes Center
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・ Stenobatyle gracilis
・ Stenobatyle inflaticollis
・ Stenobatyle miniatocollis
・ Stenobatyle prolixa
・ Stenobelus
・ Stenobia pradieri
・ Stenobiini
・ Stenobothrus


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Steno (Martian crater) : ウィキペディア英語版
Steno (Martian crater)
Steno Crater is an impact crater in the Mare Australe quadrangle of Mars, located at 68.0°S latitude and 115.6°W longitude. It is 106.9  km in diameter and was named after Nicolas Steno, and the name was approved in 1973 by the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN).

Wikistenowest.jpg|Western side of Steno (Martian crater), as seen by CTX camera (on Mars Reconnaissance Orbiter).

==Why craters are important==
The density of impact craters is used to determine the surface ages of Mars and other solar system bodies.〔http://www.lpi.usra.edu/publications/slidesets/stones/〕 The older the surface, the more craters present. Crater shapes can reveal the presence of ground ice.

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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