A new study using the high resolution camera on the Mars Reconnaissance Orbiter that's able to resolve objects only ten inches across-- think about that-- has identified what seems to be the location of the delta of a large river that could have flowed into an ocean early in Mars history.
Scientists have suspected for a while that a huge water ocean once dominated the northern hemisphere of Mars. If further work on the supposed delta supports the study, it could be the best direct evidence yet of such an ocean.
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