Scientists found a massive 'bathtub ring' that could prove Mars once held a vast ocean
PC: Reuters Scientists found an Earth-like ocean signature on Mars Mars may still preserve the outline of its ancient ocean An ocean that may have
PC: Reuters Scientists found an Earth-like ocean signature on Mars Mars may still preserve the outline of its ancient ocean An ocean that may have lasted for millions of years Ancient river deltas add support to the Mars ocean theory What it could mean for ancient life Questions that remain unanswered
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