There are Earth clouds which are supposed to be 'ice crystals' which form in the upper atmosphere. Look it up in Google and see what they look like. Not just limited to Earth polar regions I think.
Droplets on a leg of the Mars Phoenix lander are seen to darken and coalesce. Nilton Renno, a professor in the Department of Atmospheric, Oceanic and Space Sciences says this is evidence that they are made of liquid water. Credit: NASA/JPL-Caltech/University of Arizona/Max Planck Institute. Click for large jpg image by Staff Writers Ann Arbor MI (SPX) Mar 19, 2009 Salty, liquid water has been detected on a leg of the Mars Phoenix Lander and therefore could be present at other locations on the planet, according to analysis by a group of mission scientists led by a University of Michigan professor. This is the first time liquid water has been detected and photographed outside the Earth.
already found it by the Phoenix LanderThe Phoenix Mars Lander has spent months searching for liquid on the Red Planet. Now it appears that water has found the intrepid spacecraft.
Several photographs taken by Nasa's explorer show what look like water droplets clinging to one of its robotic landing struts.
Nilton Renno, a professor from Michigan University and co-investigator on the Phoenix mission analysed the images alongside several colleagues.
As NASA was looking for water on Mars they showed us this picture. How much of water should be needed to produce so massive clouds. As far as I know this remove part of the true protective layer.
Landing on Mars looking for water is not true they should see this clouds from faraway. The head of NASA Phoenix expedition ought to looking for water in his own sink it is more cheaper.
NASA call this: Ice Clouds in Martian Arctic (Accelerated Movie)