Main Question or Discussion Point
I havn't seen this posted here, but its a nice picture of ice on mars.
Is this the result of a comet hitting mars and depositing the ice?The crater is 35 kilometres wide and has a maximum depth of approximately 2 kilometres beneath the crater rim. The circular patch of bright material located at the centre of the crater is residual water ice. This white patch is present all year round, as the temperature and pressure conditions do not favour the sublimation of water ice.
It cannot be frozen carbon dioxide since carbon dioxide ice had already disappeared from the north polar cap at the time the image was taken (late summer in the Martian northern hemisphere).