Question

Which planet other than earth once had water on its surface

Answer 1

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ANSWER :-
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> The dwarf planet Ceres is the only planet which once had water on its surface.
> It is proved by the scientists that their are many evidences of underground oceans have also found.

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Answer 2

NASA confirmed that liquid water flows intermittently on present-day Mars.

evidence of an underground ocean suggests that Enceladus is one of the most likely places in the solar system to "host microbial life".