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Vast ocean covered one third of surface of Mars

Vast ocean covered one third of surface of Mars [Then BP arrived.] 13 Jun 2010 A vast Earth-like ocean covered a third of the surface of Mars 3.5 billion years ago, new research suggests. Scientists believe it stretched around the planet's northern hemisphere and held 10 times more water than all the Earth's oceans combined. It may also have provided a cradle for the emergence of extraterrestrial life.