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Chances of life are linked to water

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This image from the Mars Orbiter Camera clearly shows large contraction-crack polygons which may have developed as a result of the repeated seasonal or episodic melting, freezing and movement of water in an active layer overlying an ice-rich permafrost zone. (The scale bar is 200 m.)

Credits: Image courtesy of Nature and Victor R. Baker (University of Arizona)

Last update: 21 October 2004

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