What is a petroleum geophysicist doing on the planet Mars? Well, I can hardly be looking for oil! Given Mars mission costs of US$50 billion per trip, no conceivable resource, not even gold or diamonds, could be worth carrying home. What everyone is looking for on Mars is water

The idea of water on Mars has fascinated humankind since the days of Percival Lowell and his hauntingly prophetic, yet fatally flawed, story of the canals of Mars (Figure 1). The vision of an older, wiser race of beings, living their last days on a parched desert planet...

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