Since 1991, planetary scientists have floated the idea that Mars once harbored vast oceans that covered roughly one-third of the planet. Two long shore-like lips of rock in the planet's northern hemisphere were thought to be the best evidence, but experts argued that they were too "hilly" to describe the smooth edges of ancient oceans.
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Wednesday, June 20, 2007
Mystery solved: Mars had large oceans
Posted by TimToTango at 2:38 PM
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