Until now, Earth was the only planet known to have vast reservoirs of water in its interior.NASA The interior of Mars holds vast reservoirs of water, with some spots apparently as wet as Earth's innards, scientists say. The finding upends previous studies, which had estimated that the Red Planet's internal water stores were scanty at best -- something of a surprise, given that liquid water apparentlyflowed on the Martian surfacelong ago. "The results suggest that water was incorporated during the formation ofMarsand that the planet was able to store water in its interior during the planet's differentiation," Hauri said. "Not only does this study explain how Mars got its water, it provides a mechanism for hydrogen storage in all the terrestrial planets at the time of their formation," lead author Francis McCubbin, of the University of New Mexico, said in a statement.
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