In perhaps one of the most significant scientific discoveries on Mars this century, and in light of recent claims Mars' past may have been drier than previously thought, researchers are conclusively saying that water still remains on the surface of Mars.
The canyons and canals that are hypthesized to have contained Martian water may actually have because Spirit's X-Ray spectrometer called APXS captured significant data about the water.
Oceans and surface water likely evaporated, but not before much of the water went underground and much of it trapped in mineral compounds beneath the surface.
However, we still do not know how or why the Martian water is gone...
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