Berkeley CSUA MOTD:Entry 39077
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2025/05/24 [General] UID:1000 Activity:popular
5/24    

2005/8/10-11 [Science/Space] UID:39077 Activity:nil
8/9     Martian Crater w/ a block of ice in it:
        http://www.esa.int/SPECIALS/Mars_Express/SEMGKA808BE_0.html
        \_ Looks like a sand dollar.
2025/05/24 [General] UID:1000 Activity:popular
5/24    

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Cache (1988 bytes)
www.esa.int/SPECIALS/Mars_Express/SEMGKA808BE_0.html
printer friendly page Water ice in crater at Martian north pole Perspective view of crater with water ice - looking east 28 July 2005 These images, taken by the High Resolution Stereo Camera (HRSC) on board ESAs Mars Express spacecraft, show a patch of water ice sitting on the f loor of an unnamed crater near the Martian north pole. Map showing crater in context The HRSC obtained these images during orbit 1343 with a ground resolution of approximately 15 metres per pixel. The crater is 35 kilometres wide and has a maximum depth of approximately 2 kilometres beneath the crater rim. The circular patch of bright mater ial located at the centre of the crater is residual water ice. Colour view of crater with water ice This white patch is present all year round, as the temperature and pressu re conditions do not favour the sublimation of water ice. It cannot be frozen carbon dioxide since carbon dioxide ice had already d isappeared from the north polar cap at the time the image was taken (lat e summer in the Martian northern hemisphere). Black and white view of crater with water ice There is a height difference of 200 metres between the crater floor and t he surface of this bright material, which cannot be attributed solely to water ice. It is probably mostly due to a large dune field lying beneath this ice la yer. Indeed, some of these dunes are exposed at the easternmost edge of the ice. Faint traces of water ice are also visible along the rim of the crater an d on the crater walls. The absence of ice along the north-west rim and w alls may occur because this area receives more sunlight due to the Suns orientation, as highlighted in the perspective view. The perspective views were calculated from the d igital terrain model derived from the stereo channels. The 3D anaglyph images were created from the nadir channel and one of the stereo channels. Stereoscopic glasses are needed to view the 3D images Image resolution has been decreased for use on the internet.