Scientists working with the Phoenix Mars Lander are working to understand the water cycle on Mars. We have solid evidence that water exists well below the surface. We know water ice exists in the polar ice caps of the planet. Phoenix' robot arm dug into the soil and found water ice inches below the surface. Yet, as measured by a probe on Phoenix, the air above it is extremely dry.
Water vapor would be expected to be in the atmosphere, especially in the polar regions where Phoenix is, as molecules sublimate from the cap, for example, into the air, but Phoenix hasn't found it.
Scientists intend to dig deeper into the soil to determine how much water ice is there.
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