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Liais (crater) : ウィキペディア英語版 | Liais (crater) Liais Crater is an impact crater in the Mare Australe quadrangle of Mars, located at 75.4°S latitude and 252.8°W longitude. It is 132.0 km in diameter and was named after Emmanuel Liais, and the name was approved in 1973 by the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN).
Wikiliais.jpg|Liais (crater), as seen by CTX camera (on Mars Reconnaissance Orbiter). Wikiliaislayers.jpg|Layers is Liais crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous image of Liais crater.
==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.
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