Phoenix is designed to look for evidence that the permafrost might have been habitable (liquid water and carbon), not for life, so I think the best we can hope for is detection of carbon compounds and some evidence that small amounts of water have formed either today or in the recent past. Right now I'm just hoping it touches down safely.

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For me it's enough for the garden to be beautifull; why do so many want to see fairies at the bottom?