By Michelle Starr NASA scientists have analysed the water signatures in Mars’ atmosphere to determine that the planet once had a primitive ocean bigger than the Arctic Ocean on Earth.

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Source:: http://cnet.com.feedsportal.com/c/34938/f/645093/s/4416ff15/sc/32/l/0L0Scnet0N0Cnews0Cmars0Eonce0Ehad0Ean0Eocean0Ebigger0Ethan0Ethe0Earctic0C0Tftag0FCAD590Aa51e/story01.htm