Subsurfacewater on Mars defyexpectation

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A recent study of seismic data from NASA's Mars InSight mission has uncovered a few surprises.

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The first surprise: there is little or no ice in the upper 300 metres of the subsurface beneath the landing site near the Martian equator.

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"We discovered that the crust of Mars is weak and permeable." The sediments are weakly cemented.

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Oceanography Institute at the University of California, San Diego

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"These findings do not rule out the possibility that there are grains of ice or small balls of ice that are not glueing other minerals together."

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The second surprise defies a widely held belief about what happened to Mars' water.

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Early in its history, the red planet may have contained oceans of water.

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