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There , sunlight is blocked by the 300 - meter tall crater wall from vaporizing the water - ice on the crater floor into the thin martian atmosphere
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The existence of water - ice pockets inside craters near the martian north pole , like that pictured above and others noted previously , give clues not only about surface conditions in the martian past but also possible places where future water - based astronauts might do well to land
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Evidence that the above - imaged plates really are dust - covered water - ice includes a similarity in appearance to ice blocks off earth ' s antarctica , nearby surface fractures from which underground water could have flowed , and the shallow depth of the craters indicating that something is filling them in
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