"Mars has probably always been very cold and if (occasional melted) water rushed out of those massive outflow channels and flowed out onto the northern plain, it likely froze very quickly."
Philip Christensen, Ph.D., Planetary Geologist, Arizona State UniversityAugust 27, 2003 Tempe, Arizona - Observations of Mars go back to the 1700s. People saw bright and dark markings on Mars and they speculated that the dark areas were oceans and the bright regions were continents. So, the idea of oceans on Mars has been postulated for three hundred years.
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