SUMMARY: ESA's Mars Express has confirmed findings by the NASA Mars Exploration Rovers that liquid water must have been present on the surface of Mars for long periods. Mars Express gathered evidence with its OMEGA instrument; a visible and infrared spectrometer, which discovered large quantities of hydrated minerals across the surface of the Red Planet. These minerals, such as phyllosilicates and hydrated sulphates are created by the chemical alteration of rocks by liquid water.
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