Water ice in crater at Martian north pole

[GOD__AM]

I havn't seen this posted here, but its a nice picture of ice on mars.

http://www.esa.int/SPECIALS/Mars_Express/SEMGKA808BE_0.html

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).

Is this the result of a comet hitting Mars and depositing the ice?

 

[vincentm]

the crate that this ice is sitting in is more than likey the result of an impact from some object. The ice itself can just just a patch that was once part of the Polar ice cap, but I'm nowhere near and expert so i can't say for sure. Further studies have to be done before anyone can say for sure.